He is better but not significantly. Schwarber averaged around 40 HRS in the past 5 years. Tucker has good power, decent speed, decent average, and low strike out rate, but does he worth $500 millions?
Tucker is one of baseball's top 10-15 players. Just don't see him on the same tier as: Judge, Ohtani or Soto. Or have the same media cache that sells tickets. What he has going for him is a pretty weak FA market this offseason. Tucker, Alonso and Schwarber are the big names. There are some opt-outs like Bregman who could impact the market, but otherwise not many hitters you'd pencil in 2/3/4 in a lineup.
Tucker doesn't have elite slug, is a .270 hitter and will be 30 next season. No way I see him getting a $500M contract. I would think any GM is going to feel Tucker has ideally 8 years left. So my guess the best Tucker is looking at is $350M. And that was based on Tucker's early season play.
Schwarber is 33 and strictly a DH. It wouldn't surprise me if the Cubs couldn't get Schwarber for half the speculation on Tucker. He's a good fit- go with an OF of: Suzuki, PCA, Caissie/? and DH Schwarber.