In the US, the choice would be between the GTX 1060 6GB and the RX 580 8GB. They're pretty much neck and neck (the RX580 might have a very slight edge). These are both considered the "high or max details at 1080p averaging 60fps" cards.
The RX580 is a 185W card vs the GTX 1060's 120W, though.
In the US, the RX580 is typically available for substantially less than the GTX 1060.