My gut feeling is Miami goes to the Finals. My second guess would be Milwaukee.
Everyone who is freaking out about Harden/Embiid should keep in mind that while Butler/Adebayo is not quite that good (at least on paper), they also have a crap ton of pieces around them (i.e. Lowry, Herro, Tucker, Robinson, Dedmon... they even have Oladipo on the cusp of returning).
Also Middleton/Antetokounmpo is great plus Holiday, Portis, etc. under Budenholzer.
Sixers, Bucks and Heat can all hang their hats on defense. That is underrated