The difference is the Rolling Stones have really boring shows (still huge crowds, but mostly older people) while Iron Maiden has what many fans and industry insiders say is the greatest rock road show in the world. Their shows in Latin America are epic - not just in size, but in energy. The Stones, on the other hand, all look like they need wheelchairs and oxygen.
The Stones *did* get started thirteen years earlier than Iron Maiden, so this many years later that difference in the respective ages is very obvious.
The Rock in Rio DVD pretty much proves that in spades. They are like heroes down there. Live they really are a spectacle to behold.
And they SOUND good. And can PLAY their instruments.
I highly doubt there’s a lot of Brittany Spears style backing/Autotune going on. Basically they are a literal throwback to a more golden age of entertainers.