As FX and cazique already stated, 6-max is way more aggressive, more position plays, you can't just sit there waiting for your premium hand playing ABC poker, gotta gamble a bit there playing/raising with suited connectors, Ax suited, suited Broadway cards.
Whereas, Full ring are much more ABC, waiting for your text book premium hand raising 3.5BB PF with it, not getting a lot of action unless another playes has a monster in the hole. Not that FR games are always boring but sometimes when the whole table plays ABC, no one's ready to play unless they have a big hand, it gets kinda boring.