Hi tropicana,
It can certainly be more challenging when you are part of a couple that has different needs or preferences or where one part of the couple is more towards the “princess and the pea” end of the scale than the “I can sleep on anything” end of the scale and it can make choosing a mattress that is a good “match” for both of you more difficult. It can also make some very careful testing (with both of you on the mattress) even more important (and even then it isn’t always a “guarantee” of success").
There is more information in the first part of post #2 here about some of the different ways that can be used to accommodate a couple that have different body types or sleeping styles or that for other reasons have different needs and preferences in a mattress.
Phoenix