From worst to best:
Nights Of The Dead, Legacy Of The Beast: Live In Mexico City
The Book Of Souls - Live Chapter
Beast Over Hammersmith
A Real Live One
Live After Death
A Real Dead One
Live At Donington
Flight 666
En Vivo
Death On The Road
Maiden England
Rock In Rio
NOTD: A release full of baffling choices. The setlist is great, the audience sounds like a shotgun drenched in reverb recorded in a separate room and Bruce is at times downright unintelligible if you don't know the lyrics. There are parts where the audience is singing something and you can barely make out the line, let alone the melody sung. It's insane that this is an official release.
TBOS LC: The production on this one is awful, even though the setlist is interesting. To this day it's the only live album I haven't listened to in its entirety. Whenever I wanna give it a chance, I make it to Wrathchild, with the incredibly amateurish volume automation on the crowd and I remember why I hate this one.
BOH: Finally one that sounds pretty good. It's leagues above the previous two, but I'm not the biggest fan of the first two albums and I've had my fair share of TNOTB over the years. I simply prefer songs that came later. My biggest issue with recordings from that time is Bruce actually. His voice is powerful and the lines he's singing are seriously impressive. Unfortunately he didn't have the best control over it yet, which caused him to routinely overshoot the notes he was going for. All in all rather unpleasant to listen to. Having said all that, this album has the definitive version of Another Life. I love the different drum intro.
ARLO: I like the song selection, but everyone knows that the Real duo is plagued with performance issues. Thankfully we've got the Donington show, which is a complete concert with an overall better performance.
LAD: I know it's sacrilegious to list it that far down, but it simply has too many things that bother me. Being spoiled by later live albums, I'm not the biggest fan of the overall sound and production. Can't really fault the album for being a product of its time though. Again (you'll read this a bunch of times), but my biggest issue is Bruce. His voice is shot and he sounds so endlessly tired. Despite that, there are a ton of iconic moments and for some songs like The Trooper or Flight Of Icarus I always have Bruce's intro lines in my head, no matter which version I'm listening to. Also the end to Revelations is magical.
ARDO: Has the same issues like ARLO has, but it features a few rarities that weren't commonly heard on other live albums released up to that point like Prowler, Remember Tomorror and Where Eagles Dare.
Live At Donington: As one of the few who loves FOTD as an album, this one's great for having many of the new songs. The sound isn't the best unfortunately. The fact that they got Adrian for Running Free is also pretty cool.
Flight 666: Mostly a "remake" of LAD, with better performances and some interesting changes. It sucks that it's not one continuous show, but it makes sense with the documentary part. Bruce's best years were 1996 - 2010, so it's great to have another live album from that period.
En Vivo: While I'm not a big fan of TFF, I like the setlist for the most part. Bruce has a few slip-ups and the guitars can be quite sloppy at parts.
DOTR: From here on we've got my favorites. DOTR has a fantastic setlist. I'm happy that they brought back Lord Of The Flies. Some songs like No More Lies, that could be quite repetitive on the album, got a second chance to shine. Having audience participation and changing up some of the melody lines elevates the song immensely. Unfortunately Bruce was sick (like on too many other live albums as well lol), which knocks the album down a notch. It was also the first time I heard the third guitar harmony in The Trooper (wasn't on RIR for example), so details like that make me really appreciate this one.
Maiden England: The fact that this one has SSOASS on it puts it automatically to the top
The setlist is fantastic. We've got the majority of SSOASS, Die With Your Boots On, Still Life, Killers (what's with the weird audio glitch on the right audio channel at 0:08? Why was this never fixed?). Unfortunately, Bruce was sick during this one as well, which means that the live album isn't the best represantation of this tour.
RIR: Absolutely magical. Fantastic setlist (6 BNW songs!), a couple of Blaze songs that have become classics since then and a healthy dose of classics done justice. Having an audience of 250k people is insane and hearing all those voices singing every word and every guitar line (FOTD, the intro to Clansman, the "whoah" part toward the end of Dream Of Mirrors) gives me goosebumps each time. Bruce is in great shape and delivers a fantastic performance. The copy/pasted vocal line are weird, and I'll never understand why Steve thought that'd be a good idea, since the audience was loud enough, but what's done is done.