Plague isn't bad, but I can't speak for the discord; I haven't been in it for years after leaving it when Mercedes was a mod, so I have no idea how it is now.

Dom wise, Plague's pretty good.

I was in Ice for a bit, they're not as dom oriented anymore but when they go for it, they're pretty well organized. Discord is busy, and some of the mods can be pissy if you post something someone else already posted, so you like... have to dig to make sure you don't piss the mods/backseat modders off, but otherwise it's not bad.