Almost all aftermarket pistons are the same now. They all follow the same standards, so attesting to one over the other does not make much sense.
What DOES make allot of sense, is if you are going to be PAYING FOR NEW CUSTOM PISTONS, CHANGE SOMETHING. There is no purpose for a custom piston just for change in material. So, change compression, bore, swirl, gas ports.
Finding a company that can help you in designing a custom piston to fit YOUR needs is the company you should go with.
In my case, i wanted 90mm SR pistons, with gas ports on the top ring, at a 9.5/1 Ratio. I went with venolia.
Http://www.rpsportengineering.com
Modified by johngriff at 12:41 AM 4/18/2007