Question on relative warp resistance of engineered wood
You will want plywood for the application that you desire. The 92cm (36.22 inches) width demands a thick plywood to prevent flexing and warping. Good quality plywood that is 20mm (0.75 inches) thick should be adequate for that width just a small amount of flex. 

As a point of reference in the past I had built a platform bed for a daughter that used a 22mm (0.75 inch) thick fir plywood base that was supported along the two long edges very similar to what you are proposing. That plywood was 99cm (38 inches) wide and it was plenty sturdy enough. As a matter of fact to make that platform bed easier to easier to transport and assemble that base plywood was cut in two separate pieces instead of the full length of the bed frame.