The bike may have reved up a little quicker with the wossner, but hard to tell without doing them side by side. I wouldn't think there is going to be enough difference in performance between the selection to make a choice based on performance. I say vertex for price, and availability. Of cousre I still need to take mine out and look at it to see if it is cracked. I have crack the skirts on the weisco and wossner piston. neither came apart, but they didn't have long to go.