I will say that Simmons fits pretty well in Minnesota. They have score first guards (though, presumably they'd have to give up Anthony Edwards in the trade) and their star big man is comfortable playing on the perimeter and shooting threes. Minnesota badly needs its own "Draymond Green."
The thing is, people keep saying that Simmons is a young, more athletic Green but that's not necessarily the case. People make the comparison between two great defensive forwards who can handle and pass and aren't shooting threats, but there's a huge difference between their style of defense. Simmons, like Kawhi Leonard, is a superior individual defender to Draymond Green. Green is very good as a multi-positional defender, but he doesn't have the sheer athleticism to lock down the way Leonard or Simmons can. Where Green shines is essentially as a defensive coordinator on the court--his genius lies in sniffing out plays ahead of time, knowing where his teammates should be two steps ahead and directing them there when necessary. Simmons (and really no other current player) has shown that particular genius and that's really what a team like Minnesota needs more than a great individual defender. But still, they could use a great individual defender who can plug any single hole at need, they have other scorers and Simmons doesn't really get in the way of Russell or Towns, the way he struggled to fit optimally alongside Embiid.