I like Hermione/Ron better than Hermione/Harry. The latter would have been incredibly boring. I don't know that it would go to "sexist prize," but it would diminish her character a little in light of the Harry Sue phenomenon: ie, he would get the girl because he's Harry Fucking Potter and he gets everything, and her place in this relationship is to be awed and snarky. That is painting it a little thick, obviously, but close enough.
Hermione/Ron, on the other hand, speaks to something deeper. Not to devalue the ginger further, but Ron doesn't have a whole lot going for him, not compared to Harry. What he does have, though, is Faithful Sidekick: loyal and determined and (mostly) there for the main character. What girl wouldn't want that in a husband? Plus he has the magical family everyone wants to love. And Harry marrying Ron's sister and Hermione marrying Ron means they get to continue being one giant fluffy wizarding family.
In short:
Harry x Hermione = The Bachelor (all excitement and flash, no staying power)
Ron x Hermione = what really happens