What matters more to you - do you prefer the chain to look rather subtle, or can it be more eye-catching?
Honestly, Amazon chains never last long because they just use the cheapest materials. The problem is usually that the carabiners are made of thin metal and the cords (whether nylon or synthetic leather) eventually give way under the phone's weight. I'd recommend looking for chains made from genuine leather or high-quality synthetic leather straps - they don't just look better, they last way longer too. What's important is that the carabiner or attachment is solid, ideally stainless steel or with a good coating.
Check out specialized shops that actually make camera straps or similar stuff - they often have accessories with more stable fasteners. Or search for brands that focus on phone straps and don't just sell mass-produced junk. Some Etsy shops make really good stuff where individual people handmake them. You'll pay more for that, but it lasts years instead of months. Make sure not only the cord is thick enough, but also that the attachment to the phone itself is reinforced - with a lot of cheap products, that's exactly where it tears off.