I suspect, that like so much of our gear, the "best" camping pillow, is a personal thing. What works for one, might not work for others.
With that said, I've had it with the cheap inflatable hospital-type pillows. Likewise, I can't get a good night's sleep on a stuff sack filled with any extra clothes. Limited experiments with other inflatable pillows have left me still looking for a simple solution that' comfy and will stay put under my head.
On this last Saturday night, desperate to find a solution that would let me comfortably sleep, I pushed my clothes-filled stuff sack out of the way and folded my sit pad (a piece of the GG nightlight pads) into thirds, placed it under my head, and proceeded to sleep great the rest of the night! The pad didn't slide around at all (as I go from side to side to back to stomach and so on) and provided enough cushion (I like firm pillows) and height that I could finally get comfy and get a good night's sleep.
I think I'll continue to experiment with this and see how it goes.