For GBU, I have:A) the MGM DVD (1998)B) the MGM special extended cut DVD (first released in 2004; I got it in "The Sergio Leone Anthology" 2007 boxset)C) MGM's original BRD (first released in 2009, I got it in "The Man With No Name Trilogy" 2010 boxset)D) the Mondo BRD (2009) E) MGM's second BRD (2014)so yeah, I'm kinda nuts, too. And if they continue to release new versions I'll probably buy every one, even if they are awful.
I think for me it's:MGM DVD (1998)MGM DVD Extended cut (2004)Sergio Leone Anthology MGM original BlurayRemastered BlurayI can see me buying a sixth copy if they release another trilogy or Leone anthology with remastered transfers for FOD, FAFDM and DYS. I've basically accepted it at this point.
I think for me it's:MGM DVD (1998)MGM DVD Extended cut (2004)Sergio Leone Anthology MGM original BlurayRemastered Bluray
Yeah. I bought the anthology because FOD, FAFDM were remastered and DYS was finally being released on R1 DVD.
The latest German Blu/DVD of FAFDM is completely uncut, and was made from a different, master than the MGM stuff.
DJ is probably your guy to ask about any European release, but sadly I really don't find any difference between the remastered DVDs of FOD + FAFDM and their blurays. I popped both into my TV and compared and I honestly didn't notice a difference. Some may disagree but sadly only the R1 blus of GBU (4K), West and America (which badly needs a 4K release) are really relevant.