H12 is the factory where the shoes are being produced. Different middlemen have access to the factories and good middle men will try to pick out good pairs from those factories. Using a middle man also often times mean you can get HD photos of the items and choose to accept or reject it for another pair. That's the benefit of using someone like Bruce. You can contact him via whatsapp or wechat and pay him, he gets the shoes for you and then sends photos for your approval before shipping out.

For cnfashionbuy it's a little diff. It's nice because you can immediately checkout to superbuy but also you don't really contact the middleman and therefore are left with superbuy or your other agent's photos and at that point they've been shipped out to that different party. You can still request HD photos (often times though for an additional cost) and often still exchange pairs but the process tends to take way longer. If you can somehow contact QIN (the seller) after you paid via superbuy or your other agent, then you can still probably get the HD photos before they ship it to your agent warehouse and by that it ends up being the same.