i beta'd both, and play both. the mechanics and the play styles differ, but both games have merit.
i find myself playing eq2 more, as wow doesnt fit my play style as well. i've soloed and grouped in both games, and havent had any problems in that area. i've also had no problems with taking several days, or a week, off from eq2, as i believe both games are what you make them. you dont have to be hardcore to play either one.
most of my guild went to wow, and i'm leading the remnant in eq2. the only reason i keep the wow acct active is to talk to the rest of the guild on occasion. the game didnt hold my attention.
one of the bits i dont like about wow is the pvp, and yes, i know i dont have to go in the pvp areas, but that doesnt mean i have to like it :).
the quest systems are different. in wow, your quest items take up space, in eq2 they dont. in wow, you know exactly what you will receive from a quest before you accept it, in eq2, the npcs will hint at the reward, but you're unsure. in eq2, there's even one quest where, when you return the items requested, and the guy says, "um... yeah... i'm gonna need another 4"... but the reward isnt bad :).
i guess eq2 seems more realistic, and wow more cartoonish... but i dont say that to slam wow... just to try to clarify the tone of the game. and yes, i realize that i'm saying i favour the realism in my fantasy rpg :).
and i have actually enjoyed the tradeskilling in eq2 :). havent really tried it in wow so i cant compare em.
ooo boss alert... hope that helped :D
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EQ: Runyaessz, 5 Monk, Phinigel
EVE: Runym/Runyn/Runyl, 43M SP each
SWTOR: Pardoric, 22 Merc, on vaca
EQ: Runyariel Varyuvantel, 65 Enchanter, Tarew Marr, on vaca
LoTRO: Runyarian, 38 hunter, Vilya, on vaca
WoW: Runyarian, 70 hunter, Muradin, on sabbatical
EQ2: Runylala, 25 Troll Bard, Qey, Blackburrow, retired
WAR: Runyael, 30 DiscO Khaine, Ironfist,retired.
CoH: Hissing Chicken, 16 Scrapper, Pinnacle, retired