You can still target for assist purposes when cced/stunned. However if you still have everyone on follow and you get hit by a cc that causes movement(fear, sheep), then everyone else will still follow and get their casts interrupted and maybe even face the wrong way so it's still something to worry about.
Paladins get invulnerability to everything for 12s every 5 min(4 w/ talents). Can only be dispelled by mass dispel. It's even usable when already stunned or cced. They also have blessing of freedom to escape snares. Their dispel(cleanse) will also likely be more useful to you than the druid dispels, especially if you use totems.
Druids can shape shift to avoid cc, but I don't think they have anything for stun. They can also shift to travel form to get out of snares. If you don't want to do anything at all you can stealth, but any time the stealth would matter you'll likely get taken out of it by an aoe.
Both have good buffs. Neither can be undead.
If you want to keep the druid in tank/survival mode, they won't have much utility since they can't cast spells. The paladin has a few things he can do including heal himself, provide an aura to the party/raid(in wotlk), a single target stun(1 min cooldown, reducible with talents), a fairly low damage aoe, and can use avenger's shield every 30s to slow some enemies. While in bear form the druid won't be doing much other than that spell that prevents stealth and maybe stunning things that get close if you have rage. If you leave bear form you get a root and/or heal which might be useful but you leave yourself vulnerable.
Warriors are pretty much druids without the option of changing forms to root/spell or their good buff, but they can be undead. It's also said they require the most attention out of the tanks, but that's more for pve. If you're just sitting there doing nothing then I think they'll survive the longest though.
Death knights look like they might have some gimmicks, like that ability that pulls targets near you into 20 fire totems. I'm guessing they would be above warriors at least, but I haven't played one or really dissected what they can do yet so I dunno.
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