What is the best band ever?

Actually they gave up touring because Lennon, and to a lesser extent all of them, became weary of the road routine.

It was actually George who felt strongest about not touring. It's in all the books including the Lennon interviews.

Case closed.

No

Lennon wanted to work in the studio.

Sorry rookie.

they didn't call it beatlemania for nothin' truly bigger than 'you know who'.

Just to add two not mentioned if we are truly talking only about cumulative blazing talent:

Mahavishnu Orchestra (McLaughlin/Cobham/Hammer)
Weather Report (Zaiwanul/Pastorius/Shorter)

and support for:
Beatles (for breaking new ground)
Floyd (best Stadium guitar/angst rock)
ELP (instrumental speed and agility)
Supertramp (Rick Davies was a genius)
SRV dbltrbl (nobody touches Stevie and JMac on guitar, though Gilmour is close)