Statistics say that Real Madrid is the best club in its consistency in the Champions League and also in La Liga, it can be seen from the number of times they can win the Champions League title and their consistent performance in La Liga. So with that I say that they are indeed the best club in the domestic league and in European competitions. This season they are also the favorites to win the Champions League again although that does not fully guarantee that they can do it again, because the competition in the Champions League is very tight. Moreover, they have not yet found their best game in La Liga, it's just that the Champions League has not started yet, therefore they still have enough time to fix it.
Even this season they've even made it more difficult for other teams contending with them in any of the competition to match shoulders with them and with Mbappe coming into the club, I doubt if there is any team that will be meeting Real Madrid now that won't be playing them with great fears, this alone has given them an edge to gain advantage over every other clubs out there to potentially win their matches.