Neither exists in a vacuum.
The Beatles openly and repeatedly admitted that Pet Sounds impressed them greatly and that Sgt Pepper was their response.
What if Pet Sounds i.e. a landmark album had been wrapped in all the secrecy and mystery? I suspect the lore would be even more hyperbolic but this time with good reason.
Given what was going on in Brian Wilson’s head it’s no wonder that Smile was and is a mess.
As for ‘revolutionary,’ it’s an overused/misapplied term. The 60s featured incredible, rapid musical change from many, many sources, not least because postwar prosperity combined with R&D directed at peacetime innovation meant rapid improvements in recording technology. Expanded track counts, improved tape machines, mixing desks, etc. To be fair, the Beatles/George Martin still had to rely on 4-track and their wits. Wilson was famously deaf in one ear and opted for mono mixes in many cases.
In short, experimentation was hardly unique to the two bands (to use the term generously) but having the best pop songwriters on either side of the Atlantic certainly didn’t hurt their chances.
To be heretical, I think Pepper is overrated among the Beatles’ catalog - there are some clunkers on it despite the mindless praise they get - and Smile, as before, could never be the finished article due to the state of mind of its creator.
Brian released a solo version of Smile in 2004. In 2011 he released a pretty darned near finished mix of the original recordings. Surfs Up is one of the most beautiful songs of all time.
I agree about Sgt. peppers being overrated.
I think I would have liked to have been high with you ...