Ronaldo and Messi are both great and talented players in the history of football, they both create new history in every El-Classico match. Looking at Ronaldo's individual achievements, he is a player who has not been beaten by Messi in scoring goals and also his individual achievements while playing for a big team before playing in an Arab country. Ronaldo's record to this day continues to make many people still admire and respect what he does both on and off the field. Messi has also successfully lifted the world cup, which is also a good achievement, but overall Ronaldo's record still cannot be rivaled in various aspects in football and other events.
Both definitely feel like they are the greatest to ever play this game, we are so lucky to watch them when they were on their prime and their games against each other was always amazing to see as well.
I loved watching them beat each other too, it was never dominated by one side, both teams won and they had draws, they had calm games, and they had big fights, everything happened during that time. Both teams ended up winning UCL as well, which is awesome to see, obviously Real won more, but during Messi time it was a tie I think.
All in all I can say that it's a great feeling to see them play, but now they are old and they are both playing in leagues that are way below any European league and comparing them today makes no sense, they just gave up. Ronaldo technically didn't, if he played in some European club he could have, he just preferred money, and after 20 years of professional awesomeness, why wouldn't he, and Messi preferred destination, Miami, very nice place to retire.