For example the most successful clubs and most powerful in South American history are Peñarol, Boca Jrs, Nacional, Independiente, River Plate, São Paulo, Gremio, Flamengo, Palmeiras and Santos. What other do you think are great or never heard of this top 10 from the Americans clubs?
Peñarol and Nacional from Uruguay and Boca Juniors from Argentina and Sao Paulo are the only ones from South America who has 3 World Cups of clubs. So to me they are the best ones.
Counting total international trophies makes no sense, not all tournaments are the same. Like Nacional has 19 total but only 3 Libertadores. 3 Intercontinental cups as well for what you could count as top level trophies.
10 are one off-matches from short-lived competitions. Using just number of Libertadores won would likely be better.