I’m curious about trying Fallout (1997) but I saw that it exists for Steam and GOG Galaxy:

https://store.steampowered.com/app/38400/Fallout_A_Post_Nuclear_Role_Playing_Game/

https://www.gog.com/en/game/fallout

In this case, more like do I want to play Fallout on Steam or do I want to try playing it on GOG.com?

There are some other games I wanted to try on GOG.com too like Alone in the Dark 1+2+3 and System Shock 1+2 that I has discovered recently.