RPG

I absolutely love Foundry. I've been running a D&D game in it for a few years, and it blew Roll20 out of the water when we switched. Dynamic lighting, walls, and lots of little nice features make it great to use. The 5e system is good in FVTT, but it pales in comparison to Pathfinder 2e. I think a lot of that is due to the licensing differences, but I can't say for sure. As an example, if a spell has an effect (bonus, penalty), a card appears in the chat and you can drag the effect onto your character token. The bonus will become active, and it'll affect rolls, etc. Same thing for stuff like blinded. Basically, all the annoying-to-track things just work automatically out of the box. Every rule and creature is in there, and it's all coded smartly.

At this point, having played 5e live (no VTT) as well as in Roll20 and in Foundry, and PF2e in Foundry, I think I definitely prefer Foundry, and would use it even for future in-person games. It's just massively easier to prep and track stuff as a GM, and nicer for ability management as a player.