Quick review and comparison....
Both loft out to about 3" and the HG is a little bigger. The HG will of course compress more because of the down. Both arrived promptly within a week
AHE Cub....Grey M90 material, synthetic stuff $20 + shp 9x6"
Comes with nice little stuff sack and about 15" shock cord with mitten hook
Very nice little soft pillow works best under the neck and seems to be perfect for a hammock
HG Pillow....Argon material, 850 down stuff $25 + shp 13x7"
Came black with no color choice on the site although I'm sure Adam would accommodate whatever you wanted.
No stuff sack included, but I mean you really don't need one. Also came with about 3' shock cord with mitten hook and cord lock for length adjustment (I'm cutting mine down to about 20" a little excess but hey I appreciate the extra couple ' of cord and lock to use elsewhere )
Again Very nice soft pillow for mostly under the neck.
You'd be set with either one or both and they are both the perfect amount of support for me as I tend to like a flatter pillow anyway. Work with the contour of the hammock to give you what you need for head neck alignment.