Linux has a significantly lower memory footprint and that is even more so if your Bazzite install was on game mode. For modern games that REALLY want more than 8 GB that can make a huge difference on stability, average fps or both unless you are fine tuning your setup. Most portable hardware tops out at 8GB of VRAM, and APUs tend to dedicate 3 or 4 to the GPU at best.

Balls-to-the-wall on desktop hardware, though, if you're not constrained by the hardware you get more fps on Windows. Sometimes dramatically so. Not because of anything wrong with Linux, it tends to be some combination of having a conversion layer and less cherry-picked, optimized drivers. Stuff that really relies on GPU-specific features in particular, like the Spider-Man games, can grind to a halt with high end features enabled on Linux. At least that's my experience dual-booting Linux and Windows across a bunch of laptops, desktops and handhelds for the past bunch of years.

On the flipside some games that have broken or inconsistent performance on Windows can get those same types of optimizations directly in Proton and get smoother performance (although rarely outright higer averages). Elden Ring is the one everybody knows about, but there are a few more out there.

Being very OS-agnostic, I'm actually excited for Windows' upcoming game mode equivalent. It could be the best of both worlds. This is a big part of why you'd want Linux to do well, it pushes MS to refocus on actually useful stuff, whcih in turn has a good chance of moving Linux in the right direction.