Hi laqu,
There are several ways that can accommodate the different needs and preferences of two people on a mattress and there is more about this in the first part of post #2 here.
this is also where your own personal testing on different types of materials and designs as well as more detailed conversations with knowledgeable retailers and manufacturers can be very helpful because they have the knowledge and experience to help their customers deal with these types of issues that they work with every day.
In general the most effective approach is to use a combination of your own personal testing on different types of mattresses and materials so you have a good idea of which materials and mattress styles you prefer and which best meet your criteria and personal value equation along with the guidance of the “experts” that already know what you would otherwise need to learn about the “how” and the “theory” that makes your criteria possible.
In other words … you don’t need to become an “expert” … you only need to know what you need and prefer and then find the experts that make it possible 
Phoenix