Would a split tension bed or zip & link bed be best?

My husband and I currently sleep in a firm orothpedic bed which is too hard for me and great for him. I have had broken vertebrae due to cancer which have healed but give mild to considerable bone pain, my husband has occasional back problems due to physical job and prefers a firm bed, I prefer the a softer /medium feel you get from hotel beds.we wiegh 13 st and 14 st. What is best, a full bed with dual tension or a zip link option, what are the pros and con of each? Do both options come with a try or return option?Can you advise which bed would best suit our needs?
Many thanks in advance for your help.