Hi, I weight approx 10 stone and my husband weights about 13 stone. I'm 5'3 and he is 6'1. I have tried Bensons beds but do not like the gap between their zip and link beds but I did try for comfort and as we both lay on our sides as well as backs the medium/ firm was the most comfortable. Really love the look and reviews on your mattress but unsure weather to go for medium or firm please could you help.