The way I specialize is:
- JAST USA for the rare occasion they have a game I want, and I don’t want to bother with getting a patch.
- DLSite for the robust catalog of R18 games that are outside of my government’s snooping.
- DMM (with some special browser cookies to even get in) if I want to be sure my government isn’t snooping when I buy games.
- itch io for free games or games made by small time creators
- GOG for games released around 1995 - 2005
- Steam for general purpose
- Patreon if there’s a particular paid early access game I’m looking for.