Gundogan played for former Liverpool manager Klopp at Borussia Dortmund, while he won everything in the game with Guardiola at Manchester City.
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He reflected on the pair, stating: "I really appreciate Jürgen as a coach and as a person. Every time I saw him, we hugged each other tightly, like father and son.
"With Pep, I feel that the tactical approach, the possession game, all of that is clearer to me than transitional football. Pep or Jürgen?
"I have to be honest and answer Pep Guardiola for everything we have achieved together, the domination."