Yeah, you really can't go wrong with either. It depends on what you are looking for.
WoW is a much more casual players' game with fast advancement, flashy combat and a very "arcade-like" feel to it. It's very fun. If there is any negative thing to say about it, it's that we frequently hear from ex-WoW players that state that while it's very fun while it lasts, you burn out on it quickly.
EQ2 on the other hand is a bit for the more dedicated player. More quests, more story and lore. Combat is paced differently and is more strategic. There is content for the solo'ist, grouper and raider from the newbie levels right on up to the end-game. If you take the time to explore and see and do everything you can find as opposed to just grinding through levels, you'll be amazed at the staggering amount of diversions there are to be had. If I had any gripes about EQ2 it would have to be with the market value of certain tradeskill professions and the economical viability of the same.
But like I said, you can't go wrong with either of them. They are both fun in their own rights and there are good times to be had in each.