Which of the Big Three has the best relationship with their latest tennis coach?

[Megafanoftennis100]

Which of the Big Three members has the best relationship with their latest tennis coach?
Since Federer retired last year, we will consider his years on the ATP Tour before 2022.
I also specifically said the 'latest' tennis coach, because otherwise, we would have to consider Toni Nadal for Rafa, in which case Rafa comfortably wins this poll. As the saying goes, "blood is thicker than water"

So, what would be your beliefs on this matter?

 

[Rosstour]

Djoko and Ivanesevic seem to argue a lot but can't argue with the results.

Fedecic seemed to get along so well. Never a hint of tension. But he didn't win 40 Slams so eh