I would say "Decline of the Western Civilization" myself also, because while I like Brit bands the more seriously political brit bands came after the time of that documentary. While it is true that golden age of Punk was from 76' to 79' or so, which had great Punk too, but the main beliefs in it was backed up more in the 80's especially with American Hardcore and Brit Anarcho/Political/Hardcore bands which as I mentioned was more in the 80's. It is true that the Clash was around in the 70's, but the Sex Pistols were actually situationalists as opposed to being very political unfortunately. The Clash was more political but you can't say the whole "Punk-the Early Years" film was based on the Clash & while it is true that people were fed up in England. Usually I remember anti Thatcherisms & anti conservative party attitudes didn't flourish in England as in the 70's as much as anti nazi which is as good idea too, but nonetheless it was as activist & political related till as much till as I mentioned the 80's. So I have to go with "Decline of the Western Civilization" because it delved deeper into the psyche of Punks & the music scene in LA for example with even showing the angst of the youth more & no just interviews, plus it was more about the music, beliefs & attitudes as opposed to mainly the look & just being rebellious in general with the music. I know people will disagree on that, but back in the 80's as opposed to the 70's there was events like "Rock Against Reagan", plus bands in the 80's started putting out independent labels to get the music out as opposed to dealing with exploitive corporate labels that a lot of the 70's bands dealt with. The 80's expanded Punk even from it's most seminal, minimalistic to it's rawest & loudest, but definitely purist as well besides having it's most fury. Besides that "Decline of the Western Civilization" brought up fanzines besides showed Darby Crash who intentionally overdosed himself to death, who I have to give more credit than Sid Vicious & the Pistols did start with Glen Matlock after all who was better musicianshipwise, but not wild as Sid. So yes, I'd have to go with "Decline of the Western Civilization Part 1", between those 2 documentaries as better describing the Punk movement.