I do for Germany and France something similar, but based on tons of tested single cards (reference and custom designs). I've tested in the last two years over 200 cards (four generations!). This sounds like a shitload of work and yes, it is horrible. But I'm using only older games. This prevents me before driver issues, new patches and so on. It is a long-term job, but nothing for the moment to say "Hey, this card is definitely better than the other one"....
I've learned one important thing over the last years:
Take an older game, the drivers are optimized to dead. You get a good idea, what a card may deliver if all conditions are perfect. But this doesn't reflect the current state with current games. DirectX12? Holy shit. Not one implementation is near the possible optimum and all this additionally DirectX12 renderpaths are the pure patchwork. Paid/supported/boycotted by brand A or N. Which suite of games or apps you will take to make such tables? I really have NO idea, because the conditions are changing daily! One new driver and the RX480 beats the GTX 1060 (and vise versa).
It is simply impossible to say, how a card will perform in the future. It's like forecast. If the weather will be as reported, the TV-guy is like god. If not, he is a stupid idiot and you will hate him.
And what I think about all this AMD vs. Nvidia battles:
Nursery level. If you want to pay more to get a good (and efficient) solution for the moment: buy Nvidia. If you like their proprietary functions, driver gimmicks and you like the absolute high-end: also buy Nvidia (if you have enough money to burn it). If you like to change the card each year and to sell the used card faster/better: buy Nvidia. But this is only one side of the medal.
If you are searching for an (mostly cheaper) alternate with long-term qualities: buy AMD. The R9 390X ist a perfect oven for a hard siberian winter, but this card devilvered and delivers over generations a good performance! To be clear: it is a face-lifted R9 290X and can beat actually with their 8GB in some cases also a R9 Fury! Where the hell is a GTX 770 or GTX 780 (Ti)?
And exactly this is what I mean:
It is impossible to say, which brand/card is better over a long term. It is a snaphot for the moment, nothing else!
And for my roundups:
It is more interesting and a better help for the readers to compare cards based on their technical facts like cooling solution, PCB and wiring design, possible Hot-Spots, component quality, power consumption and so on. I will finish in a few days the RX480 roundup with eight(!) cards included (in two parts). Ok, a benchmark part is a must-have, but it is not in the main focus. I will check, which card can hold the clock rate under which conditions, if the mainboard slot is overloaded with too high current, how the cooler works and which noise will be emitted.
To do this, I need the right equipment and methods. We will publish before this roundup a longer "How we test..." to be more transparent than the most of other sites. I will show, which test system I developed in the last months to be more realistic. And - to be honest - you can lose in a closed case more FPS with a stupid VGA cooler than expected. So the main question must be: which custom card can beat the competitors card and why. It is really stupid and too simple to say, a RX480 is generally faster or slower than a GTX1060. But I can say, that an RX480 from brand A or B ist crap and will never beat the green card. And vise versa. To be political correct 😛