I'd have to disagree - with the new MSRPs, AMD blows away Nvidia on price/performance. And on performance with the R9 290x. But when you take into account the miner fools driving up AMD prices, if you're in the market for a card right now, Nvidia may be your only realistic option. Otherwise wait for prices to go back to normal. Oh and with RadeonPro, AMD cards can do Dynamic Vsync which is what I suspect is the same as Adaptive Vsync.
Also while Nvidia focused their efforts on 3d display, which hasn't really taken off in the market, AMD has been focusing on multi-monitor. If you want a seamless, 1 minute setup desktop/gaming system sprawling across 3-6 monitors, AMD is the only way to go.