idk what makes that transition from good to great comic, but what makes me coming back to reading the comic is first and foremost is the humor, something like for example, i recently binge read a comic right here on tapas, name of the comic is "Baskets of guts", created Joe Duncan translated by caledfwlch, the comic literally gave me lol moments, art style was consistent, backgrounds conveyed what shit is happening at which place, pacing was good, kept me hooked (has 1474 episodes, and author didn't specifically mention, what the lead's role name was...that kinda hooked)...its hilarious comic overall imo and is must read :)...
The same thing i felt while reading Gintama, at times i felt the humor is better than one piece (now reading for sake the of mystery surrounding one piece and void century), whereas Gintama has no exaggerated power ups and the dynamics between trio and other different characters like katsura and his funny shit trying carrying out rebellion, so its again humor and how the jokes are set up...
now i am reading Dandadan, this also has that humor thing going on, but the comic has some sense of "urgency" which i can't decide whether i like or not...
i also keep going back, reading other comic formats, you know like newspaper comics, satirical political cartoons/comics and other simple 4 panel comics
so overall i must say humor and how the jokes are set up is what makes it a standout piece at least for me
btw happy holidays to you too man 