You may ask, but don’t have a good answer yet lol. My tanking experience in Classic is almost completely prot warrior, I’ve only started leveling my druid. So I really don’t have a good comparison yet. I decided to try it because I like the flexibility of the druid class.
Back in the original Wrath, I tanked as prot warrior with another guy who would ONLY play bear. We tanked all of all the raids just fine. I was always a little jealous of his ability to shift into cat and DPS when he didn’t need to tank.