Well best is just as subjective. The Beatles were GREAT song writers and good to very good musicians. However I rank numerous other bands way ahead of them on musical talent alone, such as Rush, Mahvishnu Orchestra, Weather Report, Steely Dan, Allman Brothers, Pantera, Genesis, Pink Floyd etc.
The Beatles were great at song writing and greatly affected popular culture but that does not mean they are great technically, which I highly value as far as judging a band. Mahvishnu Orchestra, Weather Report among others are so technically great that they dont fall into popular music for that genre.
But this whole thing is very subjective so calm your tits and keep your panties under control.
To have a meaningful discussion we need to set some boundaries:
What classifies as classic rock? What are its defining characteristics?
What time periods?
What genres can be included?
How do we weight technical ability versus popularity, because most people do not appreciate technical ability but prefer easily digestible songs with catchy hooks.
I could go on but will rest here.