Right now Nvidia is better, NGU runs unusually slowly on Polaris (AMD's 480/580). Also the 480 and 580 are good for mining so they are often hard to find right now. The 1050 Ti is a great card for madVR but there are probably a few options you can change for better performance with madVR. HDR -> SDR in high quality is relatively difficult so you need change to low quality mode with something like an HD4600:
