>>87709110Jackie will most likely be revealed to be flawed in her own ways.
Star is a goofy idiot with a huge list of flaws yes but her personality is more distinct and strong and she's cuter (imo)
You do also have to remember that Marco is a pretty damn good fighter and that the shit they've been through together has built a bond between them and that Marco is kind of committed to the conflict at this point, the ol' "relucant hero" archetype.
Jackie is a more idealized girlfriend but because of that Marco seems to have trouble seeing her as a human being on the same level or as a friend, which is an important first step to a successful relationship.
Marco is also kind of stuck with Star, in any case, though if he ditches Jackie just because cucking Star is making her sad that would be about as infuriating a cop-out as all those times Dipper had to abandon his dreams for Mabel.
In the end I find that Marco and Star just seem to have more compatible (dorky) personalities. Jackie just doesn't even seem like a real person at the moment.
I'm along for the ride in any case, whatever happens to Jackie and Marco's relationship (and you know something will) will be quite the twist