Easiest is a matter of what you think I.E priests are the best healers, as well as warriors...well, if they know how to use them. My friend (priest) out heals any healing class on my server, as well as I can tank better then any tanking class. Its a matter of skill really... but priests and wars are the best classes if used properly.
well to really answer your question...I'd say wars are pretty good, lots of damage dealing abilities that do damage and gain agro, and for healing...I honestly don't know, as I don't play a healer
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All of them have different strengths and weaknesses.
For instance, Pallys are stupidly easy to tank multiple mobs with. They make excellent Off Tanks for Bosses that spawn adds, and great main tanks for trash mobs. Warriors on the other hand excell at tanking one single mob or boss.
With that said, the lines have bee blurred a little for WotLK.
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