Bakuman is good, but had it fair share of weak arcs not planned properly and wasted characters. I still like it a lot though, but it isn't really consistent. Sket Dan is comedy more than slice of life. Oyasumi Punpun is still on my to-read-list.
So, it comes down to two manga by the same author. Azumanga Daioh was lot of fun and really did well for 4-koma. But Yotsuba&! is just step beyond. So full of life. I always feel good when reading it. It's amazing.