here are the list of all GPU that best for mining XMR and other coins.

1. Sapphire RX 580 8GB GDDR5 - A single card manages around up to 670 H/s. Not only best for XMR mining but in other coins as well.

2. Nvidia GTX 1080ti 11GB GDDR5 - Nvidia GTX 1080ti is certainly one of the most competent GPUs for mining. With this card you can generate up to 1000 H/s in a single card.

3. AMD HD 7990 6GB DDR5 - although its a older version of RX series it is a best alternative GPUs for mining for the 1st two card.

4. AMD RX Vega 56 8GB HBM2 - with this single card it can generate up to 1800 H/s.

5. Sapphire Radeon Pro Duo 8GB HBM - it can generate up to 1600 H/s.