Pieces of Eight and Grand Illusion are ok albums too. I guess it depends on whether you'd call songs like "Come Sail Away" a decent hit or total cheesy ass crap. (I'd say it's better than "Dust In The Wind" no matter how you look at it though.)
"Carry On Wayward Son" is pretty much the only time Kansas didn't completely suck. Both bands have some dismal lows, but at least Styx developed their own style and had a larger number of decent-to-good hits.