I have tried a few pillows and by far the beat pillow I have had and still have is Dunlopillo.
Dunlopillo Super Comfort Full Latex Pillow Firm, White https://www.amazon.co.uk/dp/B0050JNWWE/ref=cm_sw_r_apan_glt_fabc_91VKWES2FK8QMN5QJD8J
Its a latex pillow and the most comfortable thing you can imagine. Also this thing maintains its shape for years. I have had it for 2 years and its still the same.
I have also tried memory foam pillows they are nice but I find them too firm for my liking. This is a tad bit expensive but you wont be looking for another pillow for some time that I can assure.
Recently bought this, fully satisfied with it. The latex they use is unreal, it looks super soft when you handle it, but when you rest your head on it, there is all the support you will ever need, I can´t even understand how it does it...