Each team has its own characteristics with the strategies they have, all of them will definitely have weaknesses, this is the task of the coach who is on the side of the field to monitor the opponent's formation or strategy to find their weak points and then convey to the teams to do something according to their instructions so that they can break down the opponent's defense, so if you only use tiki taka it won't be efficient.
Every single team in the league have their own pattern of game and they definitely also know their weaknesses. For real madrid, they have a very good midfield and defend, if one can pull down the basic formation of the team, then I assure you for a win against the los blancos. All coaches derived joy in watching their club beats both stronger and weaker opponents. Some coaches strategy and tactics can bring down an entire team, having an impact negatively or positively.
After winning double in last season now Real Madrid is doing good job in this season and having no lost in any points which is surely an amazing start from them and Barcelona is also having good start, but they are with big changes and too many stars still having no expected results like first match in La Liga against Rayo Vallecano and then Champions League defeat against Bayern Munich giving impression they still have flaws in their team, and they need to be better for staying into top because right now things are not easy for any team if they want to win titles and surely if they want to fight against team like Real Madrid which is giving their best in all competitions not easy and need more consistency because this is big match and this will decide who is going to be strong contender for title with mostly others are struggling in their performance.