Are travel pillows really that much better than foam cervical braces?

Are travel pillows really that much better than foam cervical braces? I do not want my head to move in any direction. I can sleep sitting straight up IF my head does not bob. I've tried various pillows years ago and gave up. I decided on a blow-up cervical collar, but it ran waaaaay too hot and didn't make it more than 2 flights before forming a leak.

Most recently, I tried a TRTL knock-off I picked up in Taiwan. The required asymmetrical lean didn't work for me. Again, straight up and movement-free for me! I am AGAIN on the hunt as I have some long-haul flights this summer. I see the "best of" options and again wonder - Why not a foam cervical brace? I understand it might run hot, but that's the least of my concerns. Tell me, travelers, what do you think? Are travel pillows really worth it?