I think it's down to what they won, what impact on the game, etc. Gretzky took hockey to the sunshine belt, won loads, would have won more except for Pocklington. He changed the game, the way it was played and inspired a generation of players from outside of the traditional hockey hotbeds. McDavid is changing the game right now, we'll see a generation of speedsters coming through with quick hands. He's not had a chance on the international stage as a senior, but that will come and to date he's not won the biggest prize of all.
However, in terms of playing wise, Prime Gretzky v Prime McDavid, I think it's obvious McDavid is quicker, quicker hands, can read the ice as well as Gretzky and finds impossible passes as well as Gretz could. The only thing that Gretz's has above McDavid is probably his shooting. I've seen both play in the flesh and in the prime and I know who I see as the better player. That's not trying to dump on Gretzky, I was in awe of what he did not only in Edmonton, but right up to the end of his career and didn't or couldn't believe I'd ever see anyone challenge his status, but here we are.
The Toronto Argonauts (Canadian football) had a take your dog to a football game event once. I will say the ambient noise in the stadium had all of the dogs feeling a bit stressed, so the ears are a great idea.