I think this upcoming team has more options in terms of lineups. Brogdon is top 5 in the league in catch and shoot, wide open 3s and they are going to miss him there. He's basically Kyle Korver with the ability to play good defense. They can compensate for that with some minutes from Matthews (or more importantly if Bledsoe can even shoot 35% from 3).
The ability to go ultra-big with a really tough interior defense may end up being critical against the Sixers (or if they do get to the Finals against the Lakers).
Giannis-B. Lopez-R. Lopez-Middleton-Wes Matthews with Ilysaova off the bench.
They can also more easily play small ball against a team like the Celtics.
Giannis-Middleton-G. Hill-Bledsoe-W. Matthews
They can surround Giannis with a bunch of 3 point shooters by swapping out Bledsoe from the lineup above with any number of other players.
They are much more versatile just from swapping out Mirotic and Brogdon for W. Matthew and R. Lopez.
They basically have 12-13 guys that would be good enough to be rotation guys for many teams (Connaughton, Sterling Brown, DiVencenzo added to the guys above). Even Leuer isn't a total stiff and DJ Wilson has potential.
The Bucks are as good as any team in the league with one exception. Barring injury, it will all come down to whether Giannis improves as a shooter or Middleton takes another step. That is when they get into a half court game in the playoffs in critical parts of game and need someone who can hit a shot off the dribble at the end of the shot clock. That's what did them in against the Raptors. They'd go long stretches without scoring because Giannis couldn't do that unless he got all the way to the rim and Middleton is decent, but not great, in those situations.