Best mattress for side sleeping couple ranging in weight 9-14 st

We have a 15 year old John Lewis mattress. It is so comfy however showings it’s age and we are looking for a new mattress. We are both side sleepers and I weigh 8.5 stone and my husband is around 14. We tend to like soft medium tension having been to Benson for Beds and also a Harrison Spinks and Somnus retailer. We read awful reviews for Harrison and John Lewis was our next stop but a lot of their beds are Harrson. Help! Minefield!