To be honest, the only real way is to test it. Aside from the obvious different mobile CPU's will have different speeds, the amount of RAM (4GB vs 6GB vs 8GB, etc) the phone / tablet has can have a drastic impact on FPS. Remember on top of the RAM used by the game itself, you've also got the RAM used by the emulator, the typical 2-3GB used by Android 14 itself, plus however much "VRAM" the game normally loads onto a PC's dGPU will be emulated more like an APU - yet another chunk of system RAM. Too little real RAM and it'll start swapping to the "Virtual" RAM (a glorified swap file) that'll tank frame-rates. Ergonomics also need testing for because they're so subjective. I posted my experience here in more detail.

tl:dr - Unless you're lucky enough to find someone who not only tests the games you want but does so on a device with the same CPU, RAM and screen size as what you're planning to use, you could up quite disappointed to learn that expected FPS / gaming experience won't always match theirs, even when benchmarking the same games.

Just curious. Unless gog up and changes all the offline installers, im ok with taking my time.

Ill probably get those over time. But im still curious what people get functional to actually play :)