Mattress Toppers vs Pillows?

I have neck pain from sleeping and driving for long periods of time. I have read about memory foam mattress toppers that range from 1-4in that add comfort, but then I read about water pillows and tempurpedic memory foam pillows…I would like to buy both but does anyone know what I should invest in first, or have any tips for certain mattess toppers or pillows for neck pain?


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