Really depends what kind of server I guess. Honestly for casual fun I'd suggest live, if you want to group all the time, but hardly any content I'd suggest TLE.As I posted in another thread, I've been looking for an MMO to play casually. I considered EQ but it's just so clunky and not being able to start in Halas just kills the nostalgia hit I was looking for. Probably dead in the old newbie zones anyway. I see that the EQ2 numbers are pretty low. What's it like starting out these days?
IMO EQ2 is perfectly fine to pick up and play once in awhile if you want to casual it, and have no intention of getting "serious". If you want to relax and mess around I'd advise at least paying for Merc access (I think you still have to pay for this?) Merc will basically allow you to do any/most group content at level, if you get up to 100 you can go back and run most of the raids at least up to Velious solo as well. Although I honestly haven't leveled alts without a merc in years, it's probably super easy solo now too.
Another good thing about live, is if you don't have oodles of Vet rewards, you can buy all of them, at least the useful stuff, with Loyalty points, which you get from daily reward for doing basic activities.
Shit is just depressing and a P2W moneypit when you get to whatever the current expansion is.