The AMD-based Mining RX 470 and NVIDIA-based Mining P106 are ultimately using off-the-shelf GPUs (the RX 470 and GTX 1060 respectively), but are fine-tuned for running around the clock.
On my point of view all depends on prices of this GPUs. Normal GPUs you can sell after and gain a little bit more money, but those... not sure if somebody will want old mining video card. One more disadvantage that usually there is no any video output, so you can use this card only for mining.
What do you think ?