I specified these indicators show the Beatles are more popular in the non-English speaking world, too. You can tap into regional trends. Stuff like is tracked by Spotify, Billboard, etc. You can look at Chinese apps like QQ. You can find
bestselling album charts of all time for some countries.
*Edit*
To be more specific, looking at South America, we can even restrict this to recent popularity. Since 2014, across all major streaming platforms:
-- The Beatles have 11 songs from their catalogue that have ranked in the Top 5700 hit songs in Brazil. The Rolling Stones have zero.
-- The Beatles have 11 songs from their catalogue that have ranked in the Top 5000 hit songs in Argentina. The Rolling Stones have two.
-- The Beatles have 14 songs from their catalogue that have ranked in the Top 4000 hit songs in Peru. The Rolling Stones have four.
-- The Beatles have 4 songs from their catalogue that have ranked in the Top 4400 hit songs in Colombia. The Rolling Stones have one.
I could go on. You get the picture. This is why anecdote is mere anecdote.