Hierarchy not price matters
Only in your opinion. Thankfully pretty much every single professional review site compares price vs price.
R9 290 custom AIB cards from ~£300 - £350
R9 290X from ~£350 - £500
GTX780 from ~£340 - £480
GTX 780Ti from ~£460 - £620
So a LOT of overlap there with GTX780, R9 290X and 780T. The R9 290 is actually cheaper than all of them. The good review sites always try to compare price vs price.
If we were to follow your logic it would be 780Ti vs R9 295X.