I have used these two racquets in the past, and even the Wilson HPS 5.1 Surge X. The HPS version was the best, bar none. The nPro open is a pretty good stick, with good power from the baseline, good kick on serves and it even volleys well. The nPro Surge X is a horrible racquet that is a muted, dummied down version of the nPro Open, even the latter came out later. If you HAVE to pick one, go with the nPro Open. Otherwise, go with the new Becker Pro