There is no definitive answer to this question as different people will have different preferences. Some people find that a hard pillow provides more support for the neck and helps to keep the spine in alignment, while others find that a soft pillow is more comfortable and relieves pressure on the neck. Ultimately, it is important to choose a pillow that is comfortable for you and offers the level of support that you need. If you are suffering from neck pain, it is also advisable to consult with a doctor or physiotherapist to determine the best course of treatment.