Timing is part of the interpretation so you can't really say which pianist has better timing.
I'm pretty sure at that point, they understand the music pretty well.
Like I said, at the professional level, musicians do not have bad timing. At all. It's just not acceptable. Wrong notes, fine whatever as long as the piece is played well. Bad timing is a lack of musical understanding. I'm pretty sure at that point, they understand the music pretty well.
Martha Argerich has bad timing sometimes, she plays faster then the rest of the orchestra on some recordings
It's not argerich who has the bad timing then... it's the conductor, or orchestra that can't keep up with argerich.
If the pianist and the conductor are not together, and if the pianist is not playing in a ridiculous fashion (which mind you, Argerich DOES NOT), then it is the conductor's fault, not the pianist.
To answer the question.... Rubinstein has about the best timing of any of them. MANY have very poor timing in the strictly interpretive sense.
Who has got the best timing among classical pianists as far as you know?
Stalin .... had no indication of being a classical pianist
He did actually (and personally) write music reviews. There's a famous review by him in Pravda of Shostakovich's opera Lady Macbeth of Mtensk. Not a favourable one, incidentally.
Could you give any details confirming Stalin wrote that review himself?
I'm not aware that there is solid proof. My understanding is that it was widely known to be by Stalin, that is to say that it was unofficially made known (as is sometimes the way in regimes of that sort). Certianly Shostakovich believed it was by Stalin, as attested to in his autobiography "Testimony".