MSN. Most of my friends are on MSN since AIM isn't popular here. I like it better since you're able to change your nick to anything you want, displaying different things e.g. mood, lyrics etc. AIM only allows you to alter your s/n and that's it. And there's this person I know who has 3 s/ns and it's irking me

Nonetheless, MSN seems to be more ahead (in my opinion

), custom emoticons and display pictures ^^.
And also because even though I've installed AIM I don't use it often. I do sometimes but not regularly