If you want a no-nonsense 1v1 map, then THE ULTIMATE 1V1 MAP is the best choice. It’s lightweight and optimized. This is one of the reasons why pros prefer to 1v1 on this map.
In terms of features, the map is quite minimalistic and simplistic. You have weapons to choose from, two ramps, and a reset button – that’s pretty much it. Frankly speaking, that is all you need from a 1v1 map.