Thanks. So thinking of "lower gen than others" which one to keep, which one to delete (without regretting) ?

Hello. Over the last years I had the chance to download/collect some Led Zeppelin Bootleg DVDs. As I am only hunting for Pro-Shot recordings, my collection looks that way: 1975-05-24 London, England (Earls Court 75 Ultimate Editon) [Cosmic Energy] 1975-05-24 London, England (In The Court Of King James) [Empress Valley 2010] 1975-05-25 London, England (Demand Unprecedented In The History Of Rock Music) [Empress Valley 2007] 1975-05-25 London, England (Holy Grail) [Trainspotter] 1975-05-25 London, England (Unstoppable Metal Machine) [Toasted Condor 2007] 1977-07-17 Seattle, WA, USA (Supersonic Seattle) [Genuine Masters] 1977-07-17 Seattle, WA, USA (The Year of the Dragon) [Empress Valley] 1979-08-04 Knebworth, UK (Knebworth Masters - 30th Anniversary Edition) 1979-08-04 Knebworth, UK (Past, Present & Future - DVD 2) [Empress Valley 2008] 1979-08-11 Knebworth, UK (Past, Present & Future - DVD 1) [Empress Valley 2008] 1979-08-11 Knebworth, UK (Return Of The Dinosaurs) [Genuine Masters] So my question is: What would be the best version for: 1975-05-24, 1975-05-25, 1977-07-17, 1979-08-04, 1979-08-11 Is there also a possibility that some versions are exactly the same? Means the Bootlegers bootleg the Bootlegers? Thanks in advance, I am curious for answers/discussions. What will be of interest: Which one (of each date) is THE version to go?