I have the same desire that I believe the OP does, and that is I want to sit at chair height. My legs are 60 years old each, and while I can still walk on them all day, they complain a lot when I have to get up off the ground, or nearly so. To me, that's more important than having a back.
So I am looking at REI's 3 legged stool. For my goals, it sounds like a better fit.
That stool, the Monarch, and the slinglite all weigh 18-19 ounces. Pretty much a tie there.