Hi ryanc,
There’s a thread here with some thoughts and ideas about pillows. They are one of the most “personal” parts of a sleeping system because they are so close to our face and skin and personal preferences about feel play an even bigger role in most people’s choices than with a mattress. They are also an essential part of good alignment for the head and neck especially but will also affect the comfort and alignment of the upper body. There are some general guidelines about the needs of different sleeping positions in the thread and some good links as well.
I personally am primarily a side sleeper and I have the Malouf hi-loft plush and like it a lot.
Phoenix