I like firm pillows for cuddling and a soft pillow for under my head. I sleep on my side and curled up; usually with a leg thrown over one of the firm pillows. I usually sit the soft pillow's corner on top of the firm cuddling pillow to raise my head up a tad.
soft beds are nice, but I sleep more soundly on firm surfaces. I'm a side sleeper, but was told that sleeping on my right side is screwing up with my digestion and could cause acid reflux. Right now I'm on my stomach with two firm pillows resting underneath my hips and head plus an airline pillow to avoid too much pressure on my ear piercings.
It depends on what I'm using the pillow for. I have chronic back and neck pain, so I go from super hard to super soft depending on what's going on with that. I voted medium soft because that's what I use to sleep on, but that's only because it causes the least inflammations.
Before I switched and had enough results to stick with it, I was using a medium hard pillow and that's my ideal if my back and neck weren't an issue.
I mostly don't use pillows at all. I like to sleep on my back on hard mattresses if not the floor, itself. For a while, I was using a super worn out pillow where my head sank all the way through to the bed surface. I rather liked the cushion on the sides of my head rather than underneath. If my back is ever giving me trouble for whatever reason, a soft pillow beneath my lumbar or thorax is how I would utilize one.
With my body? I like medium soft. I need some support for my head, but soft enough to where I am not tense when I wake up. The firmer it or the bed is, the more pain I suffer. But this is based on the fact that I got to experience what it is like to be in a tumble dryer when the vehicle I was in got knocked off the road. My bones, muscles, and nerves have cracks fissures and damages that never fully healed ten years later. But with my right shoulder in pain with pressure, I sleep on my left side or back.