one thing to keep in mind is that both brands align with each others in terms of msrp/performance, the differences at the same price-points are very marginal, where the prices go wild is in the manufacturer’s (evga, asus, sapphire…) retail price, so if you have to compare two cards, do it with the msrp of the base models and then try to find a model which is close to it, just make sure the model you pick doesn’t have an habit of blowing up and you’ll be good to go, trying to optimize your choice reading hundreds of benchmarks is a pain that’s won’t net you much.
edit: you might be interested in moore’s law Is dead chart, the dude’s insufferable but the chart is pretty good.