this might answer your questions...

http://www.importbuilders.com/pistoncomparo.html

 

this topic is just like "which engine is better for turbo" It's all a matter of personal preference. CP, JE, Wiseco, Arias have all be proven to be good pistons. now just pick whichever one u can afford and has the cr and bore that u need. this argument can go on for years without a real answer because they all have been proven to work great on many different applications.