All these discussions are focusing on FPS differences of just a few either way. I'd absolutely get the SLI setup just for the driver support. Add on top of that lower power consumption, lower noise levels, and all the Nvidia exclusives, and the choice seems to be a little more clear: PhysX, DSR, Adaptive VSync, FXAA, HBAO+, TXAA, MFAA, Geforce Experience, Shadowplay, etc.
All the same, spazfishy hasn't even mentioned a desire to go with an AMD setup at this point.