In WOTLK all tanks are fairly equivalent in terms of capabilities, its just a personal preference issue at this point. There are a few random fights where one tank is slightly better than others, but with perhaps the exception of Sarth 3Drakes I don't think it makes more than a minor difference, my guild uses 2 pally tanks and a DK tank and we've cleared every 10/25 man instance and done up to 2 drakes. I know multiboxers here with pally tanks and DK tanks have cleared almost every heroic, not sure about druid/warrior but I don't imagine its that much harder.
From a dual spec perspective in future patches, all are nice as well since pallies can respec DPS/heal as can druids, and DKs and warriors have very good DPS specs as well. Most servers have an abundance of DKs and warriors so getting into pug raids may be harder, whereas feral druids seem to be quite rare.
The issue will be Uldar in the next major patch, just like the Sunwell patch suddenly made resto shamans crazy good and warriors the only possible MTs for Sunwell (and even Black Temple before that), its possible that the next raid may have encounters that require specific classes, or even for multiboxers the next 5 man may be easier with some tanks than others. Hopefully it won't happen, but you never know.
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