simple AI model question

just a quick question regarding AI models. i see that EvolveAI now has Embraer models for download. there are quite a few different models out there now, sometimes for the same type of aircraft. how do i know which are the better framerate performers? i have over 2,500 AI planes loaded, so good framerates are essential.would EvolveAI be a better fit than CDAI's models? are Aardvarks the best available? should i replace my CDAI Embraer's with EvolveAI's? any insight is appreciatedthxchris