My personal favorite is Creative because you can just hang out with your friends, build, talk, be social and relax! Sometimes there is drama and much spam but it's worth it at the end of the day to hang out with everybody.
Downgrade or Elite Survival. For Downgrade i have the most games played and Elite Survival, Most of the time its very social (Besides the TONS of drama) and also i can just relax, do survival stuff, and not really worrying about too much