Which MMO suits me?

I have a job and am in college. I dont' have a LOT of time to play games, but I still would love to get into a good MMO and enjoy playing with other people. These are the MMO's I'm interested in:

1. Final Fantasy XI(360 version): love the FF series, but heard it takes a lot of time or that you have to spend a lot of time if you want to go anywhere

2. World of Warcfraft: I hear it's great for casual fans and also pretty deep.

3. Guild Wars: don't know much about it, but I've heard good things about it except I've read after level 25 and the missions are done it's no fun

Anyways I want one of these MMO's to play, but I want one that fits my busy schedule.Please help me out.

Hi! I own all 3... don't know why, but I play them quite alot.

1. Final Fantasy XI(360 version)

FF online has one major downfalling, not alot of solo play, it also feels like much more of a grind.

2. World of Warcfraft

The leveling is definatly casual friendly, when you hit endgame its a bit less-so.

3. Guild Wars

The level cap is 20 :P LOL, most of the missions in guild wars are more "skill" based, as in they're mostly for level 20s. So youre required to know how to play rather than just level up till you can do it. My advice is to not get prophecies though, i find it the most boring campaign. Nightfall and factions are great (they're all standalone games, not xpacs) except for eye of the north which is the most recent.

Gw is definatly the most casual friendly, its not a real mmo though. *theres no fees*

FFxi is a super grind / slap in the face, its not very casual friendly

Wow has a pretty fun setup (gameplay wise) but do you'll get sucked into it and never be free again.