As a side and back sleeper who has struggled for years with getting comfortable at night, I got these pillows hoping they would help with neck and shoulder pain. They do help. 

These have a good level of firmness for side sleeping, and removing just a little of the stuffing would likely make them perfect for back sleeping (I haven’t tried this since I’m mostly a side sleeper). I also like the square rather than tapered edges, which offers better support.