I don't know if I'd agree that Bret was truly the best there ever was, even if we're just going by in-ring ability, but picking somebody else is basically just splitting hairs because Bret is absolutely in that conversation.
As a wrestler he was fantastic, my personal favourite match from him probably being the Owen Hart Tribute match against at Benoit. Character-wise I don't have a ton to say, I started watching wrestling in 2006, and I typically when I watch older content, I just watch the matches. But I've seen a bit of Bret's character work thanks to documentaries and such, and he seemed pretty solid. The Canadian thing he did seemed great. Outside of stuff like that, his look was always cool, and he always carried himself in a way that made it all matter.
As a man, loads of respect. One of the wrestlers I respect the most probably. And I just love how honest he is. Also, he's got really good taste in wrestler. I remember way back when Melina was one of my favourites, the amount of vindication I felt when Bret Hart of all people said was one of the best wrestlers in the world.
Despite all the praise, he probably wouldn't rank too high in a list of my personal favourites, as unfortunately, it's just easier to connect with wrestlers that I didn't just watch in retrospect, especially since I'll just naturally seen more of them.