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For Led Zeppelin:
From what I've heard on 'The Song Remains The Same', on some bootlegs (Blueberry Hill, 1971) and official recordings ('How The West Was Won', containing live footage of 1972), I hesitate to put this group even among the 20 best live acts of the late sixties/early seventies.
The Who &
'The Rolling Stones' before 1972 on the other hand rank live Top 5 in my eyes.
Without the help of their technicans and sound engineers, there was obvioulsy a big difference between Led Zep in the studio and Led Zep on stage.
Real great live bands by contrast were able to deliver a great sound without later overdubs and tricks.
Listen for example to the classic
'The Allman Brothers Band at Fillmore East' (1971)
The Allman Brothers played live in a totally different league than the overrated Led Zeppelin.
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