Years ago, amd had a better cpu than Intel (K5/6) so that was a bonus. ATI was better than everybody but 3dfx. Then amd bought out ATI. So for slightly older builds, the combination of amd/ATI was great. Then with nvidia acquisition of 3dfx and others, and Intel stepping up its game, from that time on until today the top cpu/gpu slots have pretty much been all intel/nvidia with the exception of 4k gaming which belonged to the radeon R9 295x2 for quite some time. Now comes Ryzen, with double the threads for less than a comparable Intel and Haswell IPC. For the money, it's unbeatable, again. Takes an i7-7700k to top them in games, but in production software some programs can almost double the Intel speeds requiring a 2011-3 to come close to keeping up with a R5 1600. Large disparity there for the expenditures. With Vega, so far the flagship was found lacking in gaming performance, yet requires more power and costs are equitable to nvidia top line, so nvidia back on top.
Budget gaming nvidia/Ryzen
Enthusiast gaming nvidia/intel
Mining nvidia /Ryzen
Hardcore production Vega /Ryzen
Does it make a difference? In real life, no. The performance of either is equitable for most ppl, it's only professionals who will benefit from tailoring builds, using a Ryzen with a Quadro for fast budget production etc. For everyone else, it's a matter of choosing the better performance for budget. You'd not want to mine with an i3/5 and gtx1050ti when a Ryzen 3/5 and Rx 470/570 will get double the performance at a similar price.