User blog comment:YourPrivateNightmare/Still waters run deep.../@comment-15244341-20130828192211

The thing with Nautilus vs Sejuani is a matter of what CC you value the most. Nautilus has more CC and harder early on, mainly his passive and his Q plus his insane AoE slow. Sejuani has her Q's knockup and her E's slow (which was nerfed quite a bit) plus more mobility thanks to having a dash. Ult-wise, I believe Sejuani's to be better than Nautilus' ult, since it applies the stun to more people far more reliably. Sejuani's tank steroid, however, is far weaker later on (25 armor is not bad per se, it's just lacklustre compared to some other steroids such as Nautilus' shield). I'd say they are about the same in terms of popularity, though Nautilus can lock people down quite a bit better.

By the way, how about Swain? He has some harsh counters in lane, but he is one hell of a scary opponent when farmed/fed a bit (read: mana regen+RoA+Zhonya's). He's also never ever played, I've seen at most two Swain players apart from myself. He even works top if he can get blue buff, even if that is quite situational, since he destroys most melee champs.