Heres why I wouldn't advise buying a Vega - look at AMDs current best card the Fury X,
its easily beaten in most cases by the 1070, especially in VR where the difference is even higher than you see in typical benchmarks such as this one http://www.tweaktown.com/tweakipedia/116/fury-vs-gtx-1070-battlefield-dx11-dx12/index.html
Fury X also downclocks itself for no reason and you have to install third party software to fix it, also lacking various features that nvidia has such as shadowplay, SMP etc,
and its power consumption is approx twice that of the 1070 ( 2x 8pin connector vs 1x 8 pin on the 1070 ). Also don't forget that Fury X cost £500 to £600 at launch, whereas the 1070 was around £350 to £500.
Wouldn't surprise me if a similar thing happened with Vega too.
ehh, what??? Really bizarre logic there.
I wouldn't advise buying Volta because the 980ti uses way more power than the 1070 and remember the 980ti cost £550 to £800 at launch whereas the 1070 was around £350 to £500.
What do I know about Volta? absolutely nothing. And I won't be basing my purchase of a card I know nothing about on card from a previous generation, especially after a die shrink.
Just like you know nothing about Vega, so how can you advise people not to buy it?
Just say you don't like AMD. Don't make up rubbish comparisons.