I do not think you can determine who the best team in baseball was objectively for any year.
Yes you can.... Look below.
List of World Series Champions
2016 World Series – The Chicago Cubs defeated the Cleveland Indians 4 – 3
2015 World Series – The Kansas City Royals Defeated the New York Mets 4–1
2014 World Series – The San Francisco Giants Defeated the Kansas City Royals 4–3
2013 World Series – The Boston Red Sox Defeated the St. Louis Cardinals 4–2
2012 World Series – The San Francisco Giants Defeated the Detroit Tigers 4–0
2011 World Series – The St. Louis Cardinals Defeated the Texas Rangers 4–3
2010 World Series – The San Francisco Giants Defeated the Texas Rangers 4–1
2009 World Series – The New York Yankees Defeated the Philadelphia Phillies 4–2
2008 World Series – The Philadelphia Phillies Defeated the Tampa Bay Rays 4–1
2007 World Series – The Boston Red Sox Defeated the Colorado Rockies 4–0
2006 World Series – The St. Louis Cardinals Defeated the Detroit Tigers 4–1
2005 World Series – The Chicago White Sox Defeated the Houston Astros 4–0
2004 World Series – The Boston Red Sox Defeated the St. Louis Cardinals 4–0
2003 World Series – The Florida Marlins Defeated the New York Yankees 4–2
2002 World Series – The Anaheim Angels Defeated the San Francisco Giants 4–3
2001 World Series – The Arizona Diamondbacks Defeated the New York Yankees 4–3
2000 World Series – The New York Yankees Defeated the New York Mets 4–1
1999 World Series – The New York Yankees Defeated the Atlanta Braves 4–0
1998 World Series – The New York Yankees Defeated the San Diego Padres 4–0
1997 World Series – The Florida Marlins Defeated the Cleveland Indians 4–3
1996 World Series – The New York Yankees Defeated the Atlanta Braves 4–2
1995 World Series – The Atlanta Braves Defeated the Cleveland Indians 4–2
1994 World Series – There was no World Series Played
1993 World Series – The Toronto Blue Jays Defeated the Philadelphia Phillies 4–2
1992 World Series – The Toronto Blue Jays Defeated the Atlanta Braves 4–2
1991 World Series – The Minnesota Twins Defeated the Atlanta Braves 4–3
1990 World Series – The Cincinnati Reds Defeated the Oakland Athletics 4–0
1989 World Series – The Oakland Athletics Defeated the San Francisco Giants 4–0
1988 World Series – The Los Angeles Dodgers Defeated the Oakland Athletics 4–1
1987 World Series – The Minnesota Twins Defeated the St. Louis Cardinals 4–3
1986 World Series – The New York Mets Defeated the Boston Red Sox 4–3
1985 World Series – The Kansas City Royals Defeated the St. Louis Cardinals 4–3
1984 World Series – The Detroit Tigers Defeated the San Diego Padres 4–1
1983 World Series – The Baltimore Orioles Defeated the Philadelphia Phillies 4–1
1982 World Series – The St. Louis Cardinals Defeated the Milwaukee Brewers 4–3
1981 World Series – The Los Angeles Dodgers Defeated the New York Yankees 4–2
1980 World Series – The Philadelphia Phillies Defeated the Kansas City Royals 4–2
1979 World Series – The Pittsburgh Pirates Defeated the Baltimore Orioles 4–3
1978 World Series – The New York Yankees Defeated the Los Angeles Dodgers 4–2
1977 World Series – The New York Yankees Defeated the Los Angeles Dodgers 4–2
1976 World Series – The Cincinnati Reds Defeated the New York Yankees 4–0
1975 World Series – The Cincinnati Reds Defeated the Boston Red Sox 4–3
1974 World Series – The Oakland Athletics Defeated the Los Angeles Dodgers 4–1
1973 World Series – The Oakland Athletics Defeated the New York Mets 4–3
1972 World Series – The Oakland Athletics Defeated the Cincinnati Reds 4–3
1971 World Series – The Pittsburgh Pirates Defeated the Baltimore Orioles 4–3
1970 World Series – The Baltimore Orioles Defeated the Cincinnati Reds 4–1
1969 World Series – The New York Mets Defeated the Baltimore Orioles 4–1
1968 World Series – The Detroit Tigers Defeated the St. Louis Cardinals 4–3
1967 World Series – The St. Louis Cardinals Defeated the Boston Red Sox 4–3
1966 World Series – The Baltimore Orioles Defeated the Los Angeles Dodgers 4–0
1965 World Series – The Los Angeles Dodgers Defeated the Minnesota Twins 4–3
1964 World Series – The St. Louis Cardinals Defeated the New York Yankees 4–3
1963 World Series – The Los Angeles Dodgers Defeated the New York Yankees 4–0
1962 World Series – The New York Yankees Defeated the San Francisco Giants 4–3
1961 World Series – The New York Yankees Defeated the Cincinnati Reds 4–1
1960 World Series – The Pittsburgh Pirates Defeated the New York Yankees 4–3
1959 World Series – The Los Angeles Dodgers Defeated the Chicago White Sox 4–2
1958 World Series – The New York Yankees Defeated the Milwaukee Braves 4–3
1957 World Series – The Milwaukee Braves Defeated the New York Yankees 4–3
1956 World Series – The New York Yankees Defeated the Brooklyn Dodgers 4–3
1955 World Series – The Brooklyn Dodgers Defeated the New York Yankees 4–3
1954 World Series – The New York Giants Defeated the Cleveland Indians 4–0
1953 World Series – The New York Yankees Defeated the Brooklyn Dodgers 4–2
1952 World Series – The New York Yankees Defeated the Brooklyn Dodgers 4–3
1951 World Series – The New York Yankees Defeated the New York Giants 4–2
1950 World Series – The New York Yankees Defeated the Philadelphia Phillies 4–0
1949 World Series – The New York Yankees Defeated the Brooklyn Dodgers 4–1
1948 World Series – The Cleveland Indians Defeated the Boston Braves 4–2
1947 World Series – The New York Yankees Defeated the Brooklyn Dodgers 4–3
1946 World Series – The St. Louis Cardinals Defeated the Boston Red Sox 4–3
1945 World Series – The Detroit Tigers Defeated the Chicago Cubs 4–3
1944 World Series – The St. Louis Cardinals Defeated the St. Louis Browns 4–2
1943 World Series – The New York Yankees Defeated the St. Louis Cardinals 4–1
1942 World Series – The St. Louis Cardinals Defeated the New York Yankees 4–1
1941 World Series – The New York Yankees Defeated the Brooklyn Dodgers 4–1
1940 World Series – The Cincinnati Reds Defeated the Detroit Tigers 4–3
1939 World Series – The New York Yankees Defeated the Cincinnati Reds 4–0
1938 World Series – The New York Yankees Defeated the Chicago Cubs 4–0
1937 World Series – The New York Yankees Defeated the New York Giants 4–1
1936 World Series – The New York Yankees Defeated the New York Giants 4–2
1935 World Series – The Detroit Tigers Defeated the Chicago Cubs 4–2
1934 World Series – The St. Louis Cardinals Defeated the Detroit Tigers 4–3
1933 World Series – The New York Giants Defeated the Washington Senators 4–1
1932 World Series – The New York Yankees Defeated the Chicago Cubs 4–0
1931 World Series – The St. Louis Cardinals Defeated the Philadelphia Athletics 4–3
1930 World Series – The Philadelphia Athletics Defeated the St. Louis Cardinals 4–2
1929 World Series – The Philadelphia Athletics Defeated the Chicago Cubs 4–1
1928 World Series – The New York Yankees Defeated the St. Louis Cardinals 4–0
1927 World Series – The New York Yankees Defeated the Pittsburgh Pirates 4–0
1926 World Series – The St. Louis Cardinals Defeated the New York Yankees 4–3
1925 World Series – The Pittsburgh Pirates Defeated the Washington Senators 4–3
1924 World Series – The Washington Senators Defeated the New York Giants 4–3
1923 World Series – The New York Yankees Defeated the New York Giants 4–2
1922 World Series – The New York Giants Defeated the New York Yankees 4–0
1921 World Series – The New York Giants Defeated the New York Yankees 5–3
1920 World Series – The Cleveland Indians Defeated the Brooklyn Robins 5–2
1919 World Series – The Cincinnati Reds Defeated the Chicago White Sox 5–3
1918 World Series – The Boston Red Sox Defeated the Chicago Cubs 4–2
1917 World Series – The Chicago White Sox Defeated the New York Giants 4–2
1916 World Series – The Boston Red Sox Defeated the Brooklyn Robins 4–1
1915 World Series – The Boston Red Sox Defeated the Philadelphia Phillies 4–1
1914 World Series – The Boston Braves Defeated the Philadelphia Athletics 4–0
1913 World Series – The Philadelphia Athletics Defeated the New York Giants 4–1
1912 World Series – The Boston Red Sox Defeated the New York Giants 4–3
1911 World Series – The Philadelphia Athletics Defeated the New York Giants 4–2
1910 World Series – The Philadelphia Athletics Defeated the Chicago Cubs 4–1
1909 World Series – The Pittsburg Pirates Defeated the Detroit Tigers 4–3
1908 World Series – The Chicago Cubs Defeated the Detroit Tigers 4–1
1907 World Series – The Chicago Cubs Defeated the Detroit Tigers 4–0
1906 World Series – The Chicago White Sox Defeated the Chicago Cubs 4–2
1905 World Series – The New York Giants Defeated the Philadelphia Athletics 4–1
1904 World Series – There was no World Series Played
1903 World Series – The Boston Americans Defeated the Pittsburgh Pirates 5–3