Rammus > Volibear?
I'm surprised Volibear is picked more often and has a higher win rate.
Rammus just seems to do mostly everything Volibear does but better (and more).
Rammus is similarly tanky but WAY MORE mobile. His Q mobility is just insane allowing him to Gank from miles away and allowing him to do BS split push/tactical assassinations/buff steals and then Q the hell out. This is stuff the relatively slow Voli can't get away with.
They have similar levels of peel (Rammus with his taunt and Voli with his Q) but because Rammus is way more mobile, he is much more flexible in how he positions. Also, because Rammus is way more mobile, its far easier to reach the backline or the middle of a fight with him and actually do something (AND be able to get out... kind of like a more advanced version of Garen's Q in/Q out... Rammus' Q is even more insane in mobility).
Voli has a passive that makes him technically tankier but Rammus is still one of the Tankiest characters in the game and his passive and abilities (converting defensive stats into offensive bonuses) encourages it.
You can't even say Volibear is easier to play. Heck Rammus is about as simple mechanically as mechanics get (Q into the battle, press W and E... then Q out... maybe through an Ult or a slow smite somewhere). I'd say Rammus is way easier to play because once you reach a target, you literally just press W and E and without fail most of the time the target will be CCed and do a ton of damage to himself. With Voli, even if you do reach the target they sometimes manage to run away because his CC (E) is far less reliable and his auto-attacks can be more easily kited away from.
So why don't we see more Rammus? Isn't he just better or am I missing something?
Way more mobile (way more flexible in positioning, split pushing, peels, assassinations, zoning etc)... way more reliable CC and peel... and honestly similarly tanky.