WW white box has always worked well for me but I have not used the 9 mm NATO rounds.
Well, as it turns out, my pistol hates WWB. Out of six rounds I fired, four of them failed to put the pistol back into battery. No other ammo that I've used in my VP9 has been problematic. Looks like I'll be setting them off to the side until I buy another 9mm that will hopefully work well with them.