One fixes the chair you have. The other replaces it.
Verdict
A cushion is cheap, portable and genuinely helps a hard or unsupportive seat, particularly for tailbone discomfort. A proper chair adjusts to your body and supports the lower back, which a cushion cannot do. Buy the cushion if you are in a dorm, a library or working with a chair you cannot replace; buy the chair if you sit at the same desk for years.
| TRALT Ergonomic Office Chair | Memory Foam Seat Cushion | |
|---|---|---|
| Lumbar support | Adjustable | None |
| Height adjustment | Yes | Raises you slightly |
| Portability | None | Carry it anywhere |
| Tailbone relief | Depends on the seat | Designed for it |
| Works with library chairs | No | Yes |
| Cost | Higher | Low |
You have your own desk and sit at it daily for years. Adjustable lumbar support and seat height are the things a cushion cannot provide, and they are what let you sit for hours without your lower back complaining.
Check TRALT Ergonomic Office Chair on Amazon
You study in a dorm, a library or a shared space where the chair is not yours. A cut-out cushion relieves tailbone pressure on a hard seat, weighs nothing and goes wherever you do, which is a much better fit for that situation.
Check Memory Foam Seat Cushion on Amazon
If you have decided on a chair and now need to pick one, we have full reviews of the Sihoo Doro C300 at around $300, the Branch Ergonomic Chair at around $359, which is the one to look at if seat depth has always been your problem, and the HON Ignition 2.0 at around $481, which is the buy-it-once option. If the desk is the problem rather than the chair, the FlexiSpot EN1 review covers that.
Adjustability to your body rather than any specific feature: seat height so your feet are flat and knees near ninety degrees, lumbar support that meets the curve of your lower back, and armrests that let your shoulders drop.
Frequently, and more than most people do. No chair makes sitting still for four hours comfortable. A short stand and walk every half hour or so does more than any equipment.
Some people like them, and the evidence is mixed. Both shift load rather than removing it, and exercise balls in particular offer no back support at all for long sessions.
Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these units side by side. Confirm current prices and specifications before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.