Peeeersonally, HHD and Psychology are kinda on the same type of subjects for me.
Whilst one subject (psych) allows you to learn about yourself and the way the world is interpreted in the mind, health allows you to learn about the world around you, in a more routine , tangible kind of way. Both have a considerable amount of memorization, although I believe psychology allows you to do so easier, as it relates to you as an individual.
If you enjoy studying about yourself emotionally, psychology is a awesome choice.
If you enjoy studying about health medically, and the way health revolves around the world, HHD is a good choice.
Why not try flipping through the textbooks, so that you can determine what fits your style?