Can you give more detail? I was a lifetime windows user and recently switched. I’m running Linux mint and steam and every game I tried on it was working as expected (admittedly my samplesize is not that big but from what I remember hades 2, slay the spire, horizon zero dawn, doom, civ5, rimworld, pal world were tried. No difference to windows. Maybe not the newest aaa games…)

In more general terms, you can look up the item at e.g. Idealo.de or other product comparison sites and then decide where to buy. Amazon is most often not the cheapest, even including additional delivery cost