Inner beast is up quickly so high burst bosses can have a 20% mitigation fairly easily.
PLD has a stun on a low CD that can be handy. I like to stun last mob in groups at half health and run to get the next group in dungeons.
PLD cross class imo is better than warriors. I have been in a boss fight where healer dies and I live through it because I have cure and can pop Convalescence and cure. Pug doesn't bring a lot to table other then 2 ok buffs.
I find some things like Holmgang and Mercy Stroke useless on warrior. Really useless for tanking.
Hallowed Ground is great to have.
I think in general these two tanks are very balanced but the things I listed above are just slight nuances I have noticed.