From what I have read it's best to use a large stipre size 128-256kb, even larger if the contoler supports. You should get more speed with larger stripes size.
It depends on the file sizes. If you have a 64 KB file, then that would reside entirely on one drive. However with a 32KB stripe, it would sit across more spindles.
Thus, it's best to test with your apps and see what works best for you. There's no silver bullet here.