Hmm...that's a tough question. >.<
Well,I really like Baka to Test,Angel Beats!,and Azumanga Daiyo...but I wouldn't say I have a favorite anime.
A friend suggested that I watch The Melancholy of Haruhi Suzumiya,and I started Black Butler a while ago...
How about you?
What anime is your favorite/are you watching now? :D