Pep Guardiola sees Chelsea as his best enemy when he was in Barcelona, so when Chelsea beat him, he resigned because he has already promised to resign if Chelsea beat him. The fact is that Pep Guardiola don't like a club that plays defensive game with him, he would hate that kind of club. But I would say Di-Mateo fraudstrated him then because he didn't believe Chelsea that was not in good condition can ever beat his complete team. If you notice Guardiola, then you should notice that what he always complain about is the club that plays defensive game with him.
Guardiola worked in Spain and then, it was only Real Madrid he sees as rival, but Real Madrid are good in sending coach that didn't give them what they want away so I don't think he really compete much with coaches in Barcelona and in Germany that he worked, even if a coach that isn't that good work there, Bayern Munich would definitely win Bundesliga. It's not German bundesliga again, it's Bayern Munich Bundesliga because Bayern Munich is the winner of Bundesliga and they never even stop, they are still winning it.
In England, if Guardiola would confess, he would say it's not easy in Premier League. It wasn't that hard for him in Spain and Germany like its hard for him here, almost all the coaches have different characteristics of coaching and you can't predict them, they can do and undo, they are ready to beat your club no matter how much you spend on players, all the twenty (20) clubs that plays Premier league are big team that have good players and good players would definitely want to win the match for their club, that is why it's always hard to beat the clubs.
In England, Guardiola have played against coaches but Thomas Tuchel and Jorggen klopp are Guardiola's foe in premier league and it's because they are good as well. To be good more than Klopp and Guardiola, then you must be extra good because they are experienced as well, just like Pep Guardiola, that is why it's not easy for Guardiola to beat them. Tuchel collected Champions League from Him and Klopp has beat him twice in this season.