Samsung.com has the Galaxy s20+ version starting at $399 with eligible trade in. Pretty great deal for this model.
Not really. I’m seeing $610 trade in value for iPhone 11 Pro Max which is likely worth more than $610. If you trade in an iPhone 7 or 8 you get it for $700+ which is still a decent price but nowhere near $389 (Samsung) or $399 (your post).