+1I have both, though my ATT is Open Combed S2 (try to get that from RazoRock) on an Atlas handle. The Wunderbar is perhaps slightly more aggressive in my experience, the ATT Seemingly the same slight edge in smoothness. I prefer the ATT, in addition to the open comb, which is generally my preference, it is superior in visible & tactile build quality, albeit at a slightly higher price. I note that RR has come around and now offers different handle styles, as ATT already was doing.
So if forced, my choice would be the American Made ATT ..