^ the situation is not so clear cut for me. If you're talking about the fierce discussion about LAD from 5 years ago in this thread.
Live After Death in the context of its time is unsurpassed.
But that context is heavy metal of early 1980s - this is the type of music that wasn't known for it's virtuosity, melodies or composition skills or musicianship, Iron Maiden being the biggest exception around, but an exception. From that standpoint of heavy metal just being a 'better played punk' in the sense that energy and vibe is everything while the correct musical performance is either missing or secondary, LAD is godlike, because Bruce actually manages to sing somewhat correctly and his bad performance just contrasts the overdubbing tendencies of the day.
Tied to that, favouring Beast over Hammersmith due to 'good vocal performance' is moot. Dickinson may be strained and out of breath on LAD but on Hammersmith he's full of air and belting out notes out of tune, which for me are ear piecing moments. The second chorus of Prisoner is particularly painful.
So if you can take imperfect performances as historical document of a young band and heavy metal in its earlier, rawer and more mistake prone phases, both of these should be grand live records but LAD is a high profile one where the stakes are much, much higher and it feels so.
But, Maiden became bigger than that, soon after. By Seventh Son the compositions and performance and stakes were on the level enough that Maiden set one foot in progressive world which is rather known for perfection in sound. Out of tune vocals or out of tune guitars, bends, simply were not allowed anymore. Smith made a couple of minuscule mistakes on Donington and he was completely bummed about it.
Forostar said that on DOTR Dickinson is strained. He might be, also like on last Rock in Rio, but he never hits a wrong note. Unlike in the 1980s.
I can't accept the opinion that LAD is their best live album, just like that, because it documents a era in the band long gone, while we're praising them because they evolve musically, both as a group and individual wise.
Basically yesterday IM released a new album to much of our hype, and I have to accept the so called "fact" that some 35 year old live thing is unsurpassed in the overall discography, partly because of the setlist, meaning nothing they've done since is actually worth playing over those selection? Now that's a fucked up opinion.