Melee staff roll is an absolute classic, but I think I like Brawl's the best. I like shooting the pictures, and seeing all the trophies I've got.
I nostalgic for the 64 credits, but they are a bit boring. In Smash 4, I remember getting frustrated by being unable to fill some small spots here and there when I felt like my hits should've filled them in. Ultimate's pretty good, but it's visually less interesting than Melee's.
You just shoot at a super slow moving and flat looking list of all the characters, assist trophies, items, etc Like what the hell is this? It's a total step down from Melee's version in every way.
I don't think I ever even got close to completing Melee's, is it even possible?
I think 3DS/Wii U is the best on a technical level - it actually uses the mechanics of the game and can be a fun way to unwind if you had a tough time in the preceding battles.
Ultimate's and 64's are ok.
I think with Brawl they must have put the actual credits after Subspace Emissary? The one they went with for Classic Mode reeks of "oh crap we should probably do something here".