I'm currently using Yeti Trailhead chairs in my 24' ProLine without tie-downs, and my clients like them better than the old school Garelick folding chairs that a lot of the Homosassa guides use. They are light and easy to slide around, but seem to hold position with an adult seated. What I really like about them is I can bag them, and store below deck while trailering.
I also have a Yeti Hondo that I bought to go in my side console Pro that will probably never leave the patio because it is so much more comfortable than typical patio furniture, plus I am also concerned about it sliding and folding it really doesn't save any usable space in a poling skiff. One of my Trailheads will probably be used when needed.
And lastly, the nice color matched bean bag chairs I was given for Christmas to go in my Pro Line may never leave my garage except for scalloping season. They're way too bulky in my opinion. A cooler with cushion is a better option than that.