Both have managed clubs that tend to be the biggest or best financially (or quality wise) in the leagues they manage.
I don't think using the 'only managed top clubs' stick is a fair one though. They are elite managers, of course the biggest and best teams are going to want them to manage them.
Guardiola has won more - but you could easily argue that Mourinho has won more impressively (with regards to clubs managed).
Guardiolas teams have always played the better football - but then you could argue that Mourinho tends. for the most part, to get the best out of what he's got.
I think both have history of improving countless players and making them better and turning them into winners.
I think both should just be appreciated for being two of the greatest managers in football.
I think Pep’s teams would have won trophies with or without him.