If your having problems with AFP which I have heard a lot of people are I would go with perfect fighter, it's flawless. If you can get by with AFP then go with Kminer.
Meh, Perfect Fighter is the most 'perfect fighter' out there, from my eyes, and the eyes of many others, I'd probably buy that if you don't like the GUI of autofighter.
Kminer is an awesome bot for mining though, and I wouldn't be dissapointed in either one, hope you're happy with your choice