Now this is a tough one. In the early and late episodes of Married... With Children, Kelly Bundy wasn't looking that great. It was only in the middleseasons, when she wore extremely tight outfits, that she really caught my attention.
Kelly Kapowski on the other hand has been a consistent cutie on Saved by the Bell. And let us not forget that photoshoot of her in the black see thru'sposing near a rock (Circa 2000).
I'd have to slightly favor Kapowski because of the latter point I made.