Watched some of Mania 20 again a few months back. Christian/Jericho didn't hold up, but is still pretty damn good. I was actually surprised at how much better I thought Christian looked than Jericho.
The Evolution tag had some fun parts but felt too long and I get bored with that match pretty easily.
I'm not terribly high on the main event but it's really good whenever Benoit was firing things up. The Helmsley/Michaels parts are pretty worthless, though. IDK why they run through the exact same punch combo stuff if they aren't good at it. And they do it in every match. But yeah Benoit was probably the best wrestler in the world in 2004 and so much of that match is thanks to him. I like the "I can beat up HHH better" gimmick through it too, and using an announce table to wipe someone out is always more fun than 'hey, you, get out. You can come back in when I roll out of the ring'.
I prefer HHH/HBK/Benoit Backlash over their Mania match.
Great match too. Better crowd, cool finish and Benoit wears the awesome red tights (I have a bias for them, lol) which is a plus in my book. It just lacks that big time feel from WM where Benoit finally achieves his lifelong dream, the MSG atmosphere and the epic post-match celebration which will live on in spite of WWE's best efforts to bury it 1000 feet deep, never to be found again.