I'll bite since I have been reading with both of these readers for several years. Interestingly enough, I (now) take the same approach with each of them. I get a reading from them once every 6 months. I find that frequent readings with Kisha and Cookie tend to result in inaccurate predictions/information. It's also a complete waste of money if you don't allow the time for things to happen.
Years ago Kisha was my "go-to" reader because she was one of the very few readers who was correct for me outcome-wise for the situation that got me into my psychic obsession. The thing is, she had a major miss for me when it came to the next relationship I obsessed over. She was right about predictions throughout the relationship, but she predicted a reconciliation that never happened, and I was seriously heartbroken. That said, I still hold her in high regard and know she is gifted. She has been accurate for me outside of that outcome prediction, which is why I read with her a couple of times per year. She also works for me when it comes to non-romance related matters (i.e. work, family, etc.).
Cookie has been terribly inconsistent for me, but I keep reading with her because she's the indulgence I allow myself a couple of times a year. Predictively, Cookie doesn't work very well for me, but she is still one of the most impressive readers I have ever read with because of what she sees. Cookie has described the location I was in during a reading, knew about recent physical changes (hair dying, weight loss/gain, etc.), and has blown me away with facts I know to be true or find out later down the road. She is insanely gifted, but doesn't really work for me when it comes down outcomes.
FOR ME, in comparing the two, I'd have to say Kisha has been the most consistently correct.