Do You Toss and Turn?

The 1999 sleep study performed at the Sleep Disorder Center of Georgia found the following:

The average person tosses and turns 40 to 60 times every night.

70% of the time you move, your partner moves within 30 seconds.

Partner tossing and turning reduces your deep sleep by 20%

If reducing motion transfer from one side of the bed to the other is a priority for you, consider a memory foam mattress. These mattresses have no metal in them at all.
The next best is a pocketed coil mattress. If you're going to have metal in your mattress, make sure the wire is not connected together, wire upon wire.
The worst is the mattress in which metal springs are wired together. These mattresses transfer a lot of motion side to side.