Regular show is starting to suck. It started going downhill since last season. There a few good episodes in between but so far it's been mediocre. Adventure Time has consistently been great ever since it started and up to now.
Plus, psychedelic surrealism>black humor. Adventure Time feels like a rated G Jodorowsky work with less midgets and prostitues though.
Adventure time. But both are awesome shows. I feel like regular shows last season was weak. But adventure time has been steady. Rick and morty is becoming my fav.