I have UNCs and BHMs both worn maybe 3-4x and I can say BHMs crush '15 UNCs in terms of leather quality. Unpopular take, I know, but it's true. BHMs are lowkey better quality than SBB 1.0 and I had both (recently traded my used SBB for ds Chi ow 2). Quiet as kept, BHM imo is the best leather on any jordan 1 ever. I can't speak on '11 banneds bc I never held them in hand, but some say SBB 1.0 has better leather than '11 banneds and if that's the case then, yea '17 BHM is quietly the king of leather quality in terms of jordan 1s.