Torges seat is hard to beat if you have a tree. If you would like to sit in the middle of a cornfield, then I'd go with the niff t seat or better yet, one of the other suggestions.
You can make the Torges seat for nothing at all in about half an hour. Only drawback is you need a tree.
You have to balance yourself just a bit with the niff t seat. That's its drawback. But if you lean against a tree, then no balancing is needed, but you might as well made yourself a torges seat in that case for no cash and 30 minutes time.
The niff t seat outshines all of them if you want instant sitting ability without even knowing that you are carrying it.
Comfort is subjective in either case.