The issue where López loses his powers because he files his taxes incorrectly. The artwork by Fernández showing a powerless López trying to stop a bus by leaning against it is peak physical comedy.
This is where the collection comes in.
However, for the completist, fan-made digital collections are often the only way to find the specific magazine-size issues from the Revista Superlópez #15 to #45 (the golden age of the Caballeros). Super Lopez Comic Cbr Coleccion Completa De Los Caballeros