If we talk about efficiency, I think Real Madrid is the best team in the world right now. However, Los Blancos do not want to stop there. They wasted no time in strengthening their already star-studded squad for next season by bringing in two more world-class talents. Endrick of Palmeiras, and the second is the "blockbuster" with Kylian Mbappe. These two players joined Real Madrid and turned the already strong Spanish team even stronger. Real became even stronger and fans even thought about the prospect that Los Blancos would Become a team that could not be beaten. Coach Ancelotti will have to do a lot of work to harmonize these stars. I am excitedly waiting for the start of the 2024-2025 season to see the combination of this tot-star team.
No team can stay unbeaten 
they might be very strong but they aren't immortal.. currently Realmadrid is the best team judging from their current squad although they are also the defending champions of the Uefa champions league, every other teams will also prepare for next season just as realmadrid is preparing so I wouldn't jump into conclusion that they are the best team overall if we haven't seen their performance compared to the scale of other teams, we are only seeing their squad we don't know what they are capable of yetIn La Liga I believe Real Madrid will be the strongest club among the others, even Barcelona because Barcelona does not have the ability like Real Madrid to recruit star players.
But Barcelona and other clubs have also prepared themselves for next season so even with the existing players they still compete fiercely.
A club that is studded with star players does not guarantee that the club is unbeatable. We can see that when PSG has lots of star players like Mbappe, Neymar and Messi, the fact is that they can still be beaten, so in conclusion, we should not overly favor clubs that have lots of star players. They are basically human beings has weaknesses.