Scotts are tough to beat for hunting releases. I currently use a Rhino, but have used the Wolf, Shark, Squarehead Rope, and Mongoose as well. They will take some serious abuse.
If they would make the Rhino head with either the rope or NCS connection, I believe that would be the perfect release-aid for loops.
The Tru-ball Short & Sweet has got my interest up too.
*Edited for unwanted Ebonics