If I had to choose between the two, KFC. But there's one around my area (not sure if it's nationwide) that's mostly found in gas stations called Krispy Krunchy Chicken. Easily beats both of them.
I've had KK as a solid #3 behind Popeye's and Jollibee, but my last two KK orders have been disappointing. I should go to Church's again to see if it can take over KK.