 If you liked
Azumanga Daiou The Animation
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 ...then you might like
Seitokai Yakuindomo
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they are both similar because they don't have a main storyline and it just random scene transitioning into another random scene during the series
Colorful characters and relationships flourish in these high school settings, though some more innocent than others.
Azumanga Daiou is is the epitomy of slice of life days for students, and so is Seitokai Yakuindomo; end of recommendation.
In all seriousness though, while both share the same comedic and nonchalant atmosphere, the main difference between the shows is in the amount of raunchy comedy laid out in Seitokai Yakuindomo, so do be aware of that.