I've played both EQ2 and WoW, and I can't say one is better then the other, as they both seem to be for different gamersl.
EQ2 seems to be full of the serious players, people who came form EQ, people who are into playing the game because they enjoy it.
PVP is different then WoW's, it isn't a button smasher anymore then WoW's PVP is. It requires skill and knowing your char if you want to be any good at it.
Sure, gold is easy to get in EQ2, but guess what? Plat isn't. Plat is EQ2 highest coin, so comparing gold to gold is like comparing Peso to 50 cent pieces, it's wrong. =)
I'm not exactly sure having more players is better for an MMORPG. Not having enough is bad, of course. I like how populated EQ2 is, there's enough people to get groups up no problem, but not so much that you are fighting over the same stuff.
I do enjoy running around WoW where you aren't supposed to go. I'd use a cheat to let me walk up hills and stuff. found some great cliffs for diving (with no fall damage turned on, of course), found some beautiful views.
I just found WoW too easy. Of course, I never really got into the end game, but when you can get from 1 to 40 in about 3 hours, it gets boring very fast.
Stupid packet editing hacks (figured out how to cast any spell I wanted) made WoW very boring. =) Impending Doom.
1 Thing WoW has going for it is that is scales down to lesser computers very well. I have a laptop with an Ati 345M in it. Crappy vid chip that Ati doesn't even support. It's equivalent to a Ati 7500, but I can play wow with it (the 2.4ghz celeron helps). There's no way I could get eq2 to run on it.
But with my x1950 I can turn alot of the eye candy on EQ2 and it looks very, very nice. Guess I need to load up wow, since I haven't played it on the new vid card.
Since you can get trials for both games, I suggest giving them both a try, see which one you like better. Maybe Wow is more suited for you, maybe EQ2 is. But there isn't a correct answer to which is better, because it's mostly about game play, and that's a personal thing. They both offer alot of the same things, quests, weapons, grouping, guilds, farmers, campers, griefiers, spammers, noobs, and of course, GM's. =)