Chair pocket, clamp or portable base?
Compare support rather than appearance.
Chair pockets
A built-in fabric pocket has its own size and depth limits. Check how it moves when someone sits.
Clamps
An attachment needs a compatible tube or edge and enough clearance. Do not assume all folding chairs share dimensions.
Steadi at a side table
The holder needs a level supported 5.2-inch area. It travels with a compatible container rather than attaching to the chair.