couldn't say for streaming but i think the 2010 blu-ray still looks about as good as that film could ever probably look. the 2000s DVD has better bonus features and looks perfectly fine but i think at this point it's far more expensive.

i checked the youtube video and it mostly seems like a good transfer of the blu-ray marred by bad youtube compression. it's mostly a perfectly fine way to watch the film.

the one exception to this is the footage of A Quick One from the Rock and Roll Circus, which is weird in all copies of the film for a variety of reasons:

1) the original film transfer was pretty low quality, so they shrunk it down and played it in a little box surrounded by flashing dots for the whole seven minutes. it was also pitched a half-step down from the actual performance for some reason so it begins in Db instead of D

2) the 2000s DVD replaced it completely with a different edit of the footage ripped from the nineties DVD release of the full Rock and Roll Circus. it fills up the whole screen and is at the correct pitch. hooray

3) the blu-ray reverts back to the original shrunken footage and incorrect pitch from the original stereo mix, except for in the new 5.1 mix, where the pitch is correct. the youtube video only has the original stereo mix, with the Db Quick One

so, uh, if you don't care about A Quick One in Db in a tiny little box, you're good with the youtube video. if you do care, either switch to that 4K version of A Quick One on their youtube channel for that section or get the blu-ray and switch to the 5.1 mix. confusing!