I play a warrior tank as my main and has seen all content down except for Heroic Anub25 so far.
My alt is a feral tank that has done alot of the non-hardcore content so far.
In my opinion, a feral tank is far easier to play. Everytime I log on to that bear, it feels like a tanking vacation. So if you're fairly new to tanking, going bear allows you to sharpen your general tanking skills like add awareness and pickup, etc without having to mash the random buttons a warrior tank has to take into account (which is the warriors niche).
The raid benefits have been covered but I'd like to reiterate that dps will not like to do sunder or expose armor (most don't even do it even though they should). So going warrior allows you to keep sunder stacks up, as well as thuderclap and demo shout, etc.
Me? I love my warrior, the bear is boring.
"I'm a rage-a-holic! I'm addicted to rageahol!" -Homer Simpson