Initially, many people doubted Guardiola quality after being promoted to head coach in the Barcelona first team, because at that time his status was as a coach at Barcelona B, especially at that time Guardiola had only started his career as a coach for one year. The opportunity given Barcelona was not wasted by Guardiola, he immediately brought Barcelona to win the La Liga title for three consecutive seasons. As a newcomer to the world of coaches who were full of competition with great coaches, he managed to make Barcelona one of the best clubs in Europe at the time.
I think Guardiola is better than Zidane who has only coached the only club, he was able to win the treble winner with two different clubs. Behind the success he has achieved with Barcelona, Bayern Munich and Manchester City, he still has the task of helping Manchester City become the reigning champions on the UCL stage. The squad that Manchester City currently has can be polished by Guardiola with the tiki-taka style that is his trademark to become a frightening club in the EPL and UCL.
Both Zidane and Guardiola certainly have their own strengths and weaknesses. There's no denying Zidane's achievements when he was active, he was one of the best of his time, and surpassed Guardiola's achievements. But during his time as coach, Guardiola slightly surpassed Zidane. In fact Pep proved with Three different Clubs in Three different Leagues. Barcelona in La Liga, Bayern Munich in the Bundes Liga and now Manchester City in the EPL, he can win with these three teams. So in the world of coaching Pep deserves appreciation for surpassing Zidane. With Zidane's break from the world of coaching, the best competition between the two has automatically stopped and only starts again if Zidane trains one of the clubs in the EPL. It will be interesting if he returns to coaching and takes part in an EPL club.
But it seems that Zidane will not train any club in the near future, until now there has been no serious news regarding Zidane's future, PSG who are interested in his services, recently appointed their new coach next season Luis Enrique, automatically adding the puzzle of where Zidane will be anchored while Guardiola will stay with City next season.
I agree with you about your comparison between Zidane and Guardiola. Zidane has an aura and players respect him more for his achievements as a player himself than as a coach. I know that he won the Champions League three times, but a lot of coincidences have led to that winning streak as well. It wasn't because Real Madrid dominated the Champions League throughout the knockout stages. It was in quite some games the case that they were the team with a little bit more luck than the others. Taking home three titles just like that will probably not happen again anytime soon. Guardiola is a real coach. Nobody talks about him as a player anymore whereas when I remember the name Zidane, I instantly think about him as a genius player, not as the coach who won the title three times.