Wayfall :
-Over heating (decreased life span)
-Game developers favouring Nvidia card optimisation over AMD
-More power consumption
-Driver issues (I have had 2 AMD GPU's in the past and the amount of time I have had to reinstall the driver due crashes, no sound, degrading performance and visual bugs)
Overheating was a problem with the early reference Rx 2xx series. Right now it's no longer an issue, other than a small bug in the recent Crimson driver that has already been remedied.
Game developers favoring nVidia... More like nVidia bribing game developers. But in any case, this is shifting. Tomb Raider, Deus Ex, all DICE games, Ashes of the Singularity, they all favor AMD. Even Fable Legends that was supposed to favor nVidia, favors AMD.
- More power consumption is true, but in reality it really doesn't matter that much. Do you know what the difference per year is between a GTX 970 and an R9 390x? Around $20 per year if you play a 1000 hours. That's gaming three hours straight every single day. The difference in power consumption between the GTX 960 and the R9 380 is smaller than those two.
- nVidia has a bunch of driver issues also. Here's an example on this forum; http://www.tomshardware.com/answers/id-2227490/nvidia-driver-crashing-recovering.html