Most groups in a vacuum will prefer SK for aggro lock at all levels of gameplay that don't require defensive discipline.
Warriors do the job well enough but generating threat requires gear/money. A sk with a set of banded (or naked) will be able to function well from the start. A brand new warrior is staring down the daunting hurdle of acquiring haste and good quality weapons (neither are cheap for a new guy) before threat is more manageable.
The *best* group tank in my opinion is the paladin, but you didn't list that class. Aggro is simple. Paladins also have group utility out the ears (lull, root, stuns, heals, buffs) with 90% Rez being the cherry on top late game. They lack the mobility of the SK and no feign death (which is amazing). If I had to pick between equally well geared tanks, I'd opt pal > sk > warrior for routine content and war > pal > sk for tough things that defensive would be useful for.
At the extremes of raid gear I'd probably go warrior for all as nobody will die regardless, aggro is trivial with high end weapons and 41% haste, and warrior dps is head and shoulders better than knight.
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