The difference between the two is pretty clearcut: Ichizon was funny.
Ichizon was nasty garbage (what's worse, in a moment of weakness I fell for peer pressure and tried it twice). With that in mind, and knowing that my and Wonderduck's tastes are usually diametrically opposed, I am likely to love Seitokai Yakuindomo. But there's is no time! This season is crazily full as it is.