A thermarest z lite cut in 3 pieces.
Whi I use it, it's multi purpose, and pretty dang comfortable.
It's an umbrella, a pillow and a seat all in 1. Makes a nice little shooting mat as well.
Helinox is great, but not for uneven ground. I also have a Walkstool Comfort for day hunting, but also not great for uneven ground. What it is better at is sitting up higher as one of the areas I hunt has over waist high brush and I need the extra height to be able to see. There are some stools out there that have individually adjustable legs that would be far better for uneven ground, but don't remember where I've seen them off the top of my head.