Rockets receive: Brown, Turner
Bucks receive: Sengun, Reed, DFS, 1-2 Celtics picks
Celtics receive: Giannis, Smith
If the Rockets want to compete for a championship, a starting lineup of Turner-Durant-Brown-Thompson-FVV would look pretty good on paper. Having a playoff-tested shooting 5 mitigates a lot of the issues with having Thompson on the court. Plus, this cleans house from a couple of the guys that Durant considered unreliable in his burner account.
Celtics get Giannis, but they also get a young shooting big to pair with him and keep the court open for him and Tatum. Giannis gets to play with the best player he ever has, and the Cetlics compete for championships. Tatum-Smith-Giannis-White-Pritchard is a pretty good starting core.
Bucks get a young All-star big that could flourish as the focal point of their offense. They also get a good young guard that can score and reclamation project in DFS. I prefer this trade package to the one that the Heat are rumored to be offering, and I slightly prefer it to either the Hawks or the Blazers probable offers.
I would rather have Myles Turner than Jabari Smith Jr as a big man pairing for Giannis.
M Turner is a legit center. Jabari isn't. He is a forward. He is a combo forward like Tatum or Siakam. A PF/SF. Jabari isn't comfortable being the defensive anchor / rim protector. He likes to defend on the perimeter. He isn't strong enough physically. He gets overpowered by centers. Both defensively and on the boards.
Giannis could defend centers but I don't know if he would. He certainly doesn't want to. He has always wanted a true center next to him who does that physical work so he doesn't have the wear and tear. And it allows him to roam on defense which is his main strength defensively.
So for those reasons, I see Myles Turner as the better fit with Giannis than Jabari Smith Jr is.