it comes down to style of play tbh.
If you get Dejounte you have a size advantage. You can play passing lanes and get a lot more deflections and steals, he'd also help with the rebounding. On offense you run what we run now, inverted pick & rolls and DHO's. The offense would have to run mainly through Wemby though, cause DJ is not the type to get into the lane and kick the ball out. He'll get to his midrange and play off of Wemby most of the time and he's also a good catch and shoot player. You won't get a lot of alley oops for Wemby or open looks for Vassell though. Asset wise you'll have more draft picks and cap space while singing a 27-year old which gives you a 5-year window with him.
If you get Trae the offense would be a whole nother animal. You'll automatically give Wemby more space to operate cause you have a guy who can pull up from the logo and bend the defense. He's also an incredible lob passer, who'd give Wemby a lot of easy dunks. He can get in the lane and create a lot of catch and shoot opportunities and would make it significantly harder for teams to double team Wemby, which is what most teams are starting to do now. Remember Trae Young is a walking top 8 offense. We'd also create a lot more free throw attempts. One of Wemby or Trae would always be on the floor, meaning we'd have a top offense for 48 minutes. Only down side might be that he needs the ball in his hands and doesn't do much off the ball.
Defensively you'd have to hide him, although that seems quite possible with Wemby guarding the paint. He's also 11th in steals and one of the best at drawing charges. You can not play any bad defenders alongside him, so you need a whole lot of 3-and-D. Asset wise you'd have to spend more, but would still have plenty of picks left. He costs more, but is only 25 which means you can have him around long term. You're basically creating maybe the best 1-2 punch in the NBA.
Naz Reid and Herb Jones are at the top of my list as well. We basically just need our picks and about 3 players to take this team to the playoffs.