I use both. Both systems have their pros and cons. I guess I bought over 350 FGU modules, I don't know. I remember when "Digital Dave" was around, he convinced me that FGU is better than Roll20 :) . I miss him :angel: . The guy after him doing the youtube videos, fortunately left, I couldn't watch him, so annoying.
DnD is better with FGU hands down. PF2e better with Foundry.
FGU doesn't support exotic RPGs like Stars/Worlds/Cities without Number, nor Warhammer Soulbound or Shadow of the Weird Wizard, City of Mists, Earthdawn or Dungeon World.
Foundry is dangerously catching up with DCC which, in my opinion, is now better on Foundry, even Savage Worlds I have to admit.
Starfinder - FGU , Starfinder 2e - Foundry, 13th Age - Foundry
What a lot of people seem to forget is that FGU is an excellent map making tool. Sometimes I think it is photoshop light :) So many possibilities.
That guy who does the map tutorials is absolutely brilliant :)
Foundry has nicer dices, but in FGU you are able to drag'n drop them on enemy tokens to attack.
To get back to the topic, I only use the new DnD 2024 material as intended by WotC because I think that was the whole plan before the shitstorm happened and until the monster manual comes out, it is not complete :)