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Definitely, Ancelotti, we know Guadiola's weaknesses this time, and they will not aim to lose to Manchester City the second time. I am confident that Real Madrid will be prepared for Guardiola, and I believe they will do their best to disqualify Guardiola in the UCL. Ancelotti and Guardiola are both very talented coaches, and everyone is doing well in their leagues.
It's not just about knowing someone's weakness but also knowing who will be available at the time of the encounter. Ancelotti may have the best strategy in place but he doesn't have the required players to execute it perfectly due to injuries.
Guardiola is fighting for first place in the league table, and he wants to win the Premier League again this season, but Liverpool and Arsenal are attempting to stop them. And Ancelotti has already top the laliga league and they are in 99% of winning the laliga title, he won't stress that crucial players in the league anymore he will focus on champions league competition. he can just put his full squad when facing Barcelona because he won't try to lose at home when facing Barcelona. I can't predict who will definitely win the Champions League this season.
This is an important factor as well. Guardiola will have a harder job to balance his team to compete in both leagues.