Topstone has a BSA bottom bracket. Trek uses a press fit on an aluminum frame when there’s absolutely no need to do so.
As well the Topstone comes tubeless ready, all you need to do is install the valves (provided) and sealant.
And for $50 additional, 105 is a great group.
Note that I own the 105 Topstone, it’s a great bike so have a bias, but ride both and then make a decision.