Shiatsu Massage Pillow ($49.99) vs. Shiatsu chair cushion ($99.99)?

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I am trying to find a birthday present for my husband. He has multiple orthopedic problems. He has had a disc surgery on his lower back and currently has several bad discs in his neck that the insurance won't cover surgery for yet. And he also has two metal hips. He currently suffers from near constant tension headaches that often turn into migraines (about monthly). Also, he spends alot of time on the computer; so, he is often in a chair that would probably work well for the Shiatsu chair cushion.

So, I am wondering, which would make a better gift - the Shiatsu pillow or the chair cushion? I am not very clear on how exactly the pillow works; I am more familiar with the chair cushion since our local drugstore has one on display.

So, I have a few questions.

The product description for the shiatsu pillow says it massages neck, back, and shoulders. Based on this, it seems it may have an advantage over the chair cushion. Is this true? How do the two compare on this?

Secondly, I'm assuming the pillow might be a little less convenient for use in a computer chair - i.e. it wouldn't stay in place as well. Is this true?

Overall, which would you recommend? And what are some pros and cons of each?