Hi Johnf59,
Pillows are even more of a personal preference than a mattress so for example while I personally tend to prefer latex or shredded latex, my DH sleeps on a memory foam pillow. Sometimes people have different pillows available because what they prefer may change with time, mood, how they feel, or the weather or seasons. The goal with any pillow is that it “matches” and adapts to your sleeping position(s) and keeps your head and neck in alignment (which provides perhaps 20% or more of the overall spinal alignment needs of your “sleeping system”).
There is more information and links to some resources and information in the pillows thread here which may help you make the best choice for you.
I personally like the freedom of movement that comes from a more resilient pillow and I also like pillows that sleep cooler than many memory foam pillows do however there are many that prefer the more “solid” feel of a memory foam pillow and think that sleeping on a latex pillow is like “sleeping on a balloon” 
Others yet prefer the more “scrunchy” or different feel or the greater ventilation of various fibers such as down or wool and others yet prefer materials like shredded latex or memory foam or some of the other pillow fillings that are available which have their own advantages (such as buckwheat hulls, feathers, kapok, synthetic fibers and others). Each have their own “fans”.
The most important part is that it supports your head and neck in good alignment (thicker for side sleeping, in between for back sleeping perhaps with some additional thickness, contouring, or zoning under the neck, and thinnest of all … or in some cases no pillow at all … for stomach sleepers). A Scrunchy pillow allows the pillow to be re-shaped if necessary when you change positions for the different needs of different sleeping positions. Some pillows can even be adjusted and customized by adding or removing filling material in the whole pillow or sections of it.
I would make especially certain that any pillow you used matched your preferences and used “safer” materials because our head and face is particularly sensitive to different “feels”, sleeping temperatures, and to odors because you are so close to the material.
Phoenix