To get rid of the discomfort, it is really important that your spine is in its proper alignment. For this, a mattress must be fully responsive. This means that it should provide cushioning effect to important parts of the body like hips, shoulders and abdomen.
The Tempur bed are most responsive, mainly due to the presence of memory foam. The memory foam is designed to contour important body parts, relieve pressure and provide them remarkable support. Shoppers will find it very difficult to buy a more responsive bed than TempurPedic.
On the other hand, the hyper-elastic layer of Purple mattress perfectly provides the cushioning effect to the body and gives it a tight hug.
Both the mattress have one issue that their comfort layer is a bit thin to provide support to heavy sleepers. So heavy sleepers may complain of pushing down to the base layer (transition layer), giving it to much pressure.