The differences between our kneeling chairs are the material, the workload, and the comfort of the chair.
Some chairs are also more pleasantly aesthetic. For example, The adjustable black one that we have has an easy way to adjust your knee angle while the aesthetics of the chair might not be the best.
As opposed to the more expensive kneeling chair that we have for $275 that has a very aesthetic look and also a comfortable material, as well it is much easier to assemble and it fits under any table that you want.
A difference between the kneeling chair for back pain and the regular kneeling chair besides the quality is also the fact that the pads are handcrafted and are easier to wash - with a wet towel or small mop due to their material.
If you like being higher (sitting higher) and feel a more hard surface then we would recommend going with the thicker cushion.
If you don't really care about how high/tall you are while sitting and you like a very soft surface that may be more compact or look nicer due to the color choice then we recommend going with the Kneeling Chair For Back Pain Handmade Version.