I'm going to say that I am somewhat of a hybrid sleeper.. I start off on my back with my legs elevated because I have back pain, but I often end up waking up on my side with my head on my husbands chest..
I used to love sleeping on my back, but since I had my thyroidectomy, it always feels like I'm choking. So I sleep on my sides now with my right side being my favored one.
I don't really have a favorite sleeping position. I normally flip flop all during the night.......to the point that I rotate like a rotisserie chicken.