Sorry, but your article is lacking details - like cost. I guess if cost is no concern, than the best GPU is just one that you can buy - and get to hash for you!
For something more in depth, with actual hash numbers etc, you might want to check out this:
http://miningcharts.com/best-gpu-for-mining-2018/
Very indepth, and covers many different aspects such as power cost etc that will help each person determine their own 'best' GPU