The OpTech straps (POTN straps are also OpTechs) have one male and one female connector on the strap, so when you remove it (can be handy when on a tripod for instance) you can connect the strap ends on the camera to get them somewhat out of the way.
The UPstrap straps don't have this nice feature, they have the same connector on both ends of the strap so you're left with the strap ends dangling from the camera. On the other hand I prefer the rest of the design so I've switched to UPstrap despite this drawback.
Strap (around the neck type)

