@DrowningEveryDay from memory it was about hem length but that's on me and I'm about 6 inches shorter than you.. so maybe it would look more cropped on you? Annoyingly I no longer have a changing room photo of it!
I reckon if you've got similar ones to Acne then go for the Balenciaga as it's that little bit different and there's fewer high street copies etc. Plus, if you buy it from a friend as you say you're likely to get a better price!