Honestly, I haven't come across a universal 'top-rated' list that felt definitive, which is probably a good thing because tastes vary so wildly within the fandom. My own favorites tend to be the ones that explore her post-war resilience, like 'The Changeling' series on AO3, which dives deep into her Slytherin legacy and the psychological aftermath of the Chamber. That story's character work feels incredibly true to someone who grew up in that war. Another one I keep going back to is 'Ginny Weasley and the Half-Blood Prince' from the 'Armistice Series'—it fills in her sixth year with a rawness the book only hints at.
The metrics are tricky; AO3 kudos can point you towards popular ones, but sometimes the real gems have fewer hits because they're more niche, like a Ginny/Luna friendship fic I adore that's all about rebuilding the Quidditch pitch. I'd say ignore any single list and just use the filters—sort by kudos for a start, then dive into specific tags like 'Ginny Weasley-Centric' or 'Ginny Weasley Is Done'. The best-rated ones for me are always the ones where she's not just Harry's girlfriend, but a full person with a temper, a quaffle, and a lot of trauma to unpack.