Barcelona had a fantastic 2024-25 season, although it would've been even better if they won the Champions League (they were the favourite).
Real suffered a bit of humiliation, especially considering they lost all direct games against Barcelona (El Clásico), but they still have a chance to salvage their reputation and make their fans happy by either winning the FIFA Club World Cup or, at the very least, achieving semi-finals or the final.
The prestige and the prize pool of FIFA CWC is similar to those of the Champions League. I believe the total prize pot is around $1 billion, so not something to be ignored.
Real Madrid did lose in every meeting with Barcelona, but I think Madrid is willing not to end the season in shame, where in the Copa del Rey and Spanish Super Cup they failed in the final, in La Liga they finished as runners-up in the final standings, and in the Champions League Real Madrid failed in the quarter-finals. This is not disappointing at all, the Los Blancos squad continues to show that they are still at a higher level, it's just a shame that in the 2024/25 season they failed to win a single domestic or European trophy.
In the FIFA Club World Cup, Real Madrid is still the best and has quite a lot of opportunities to win the trophy. In every match Real Madrid is always the favorite team, and when compared to other matches in the Club World Cup, Real Madrid's matches are always filled with fans, which shows that Real Madrid is a big team wherever they play.