I want the most performance I can get with quietness of course.
There's no "one size fits all" answer. Generally speaking, there's not going to be a nickle's difference in materials in equally well-made strings--assuming proper nock fit, tuning, silencer placement, etc.
But...there are always exceptions to the rules. Once in a while you'll run across a bow that just "likes" one material over another--no idea why--and the only way to find out is to experiment.
I've had the best luck with Formula 8125 and Dynaflight '97, 10-14 strands, with the loops padded to 18 or so.
Chad