What the hell is Levolution? Actually I don't care. Drivatar is worse because it isn't even trying to be clever, not that levolution suceeds.
Levolution is pretty bad. It's a term from BF4 that describes that each map changes as the game progresses. Essentially, each match will appear unique as the map will change in different ways each time. So, the evolution of a level. Pretty much on par with drivatar.
Levolution is definitely worse. Drivatar I believe is actually trying to describe a singular thing by combining two words: a driving avatar. It's an avatar, but it drives, so it's a drivatar. Levolution is just a level evolving. It's an event that occurs over time, not a single thing. It's just a level changing through use of the frostbite 3 engine. It isn't anything, it's not even a noun. It's the epitome of PR buzz word.