Hi Mojoesimpson,
While only one of them is a member of the site and provides the additional members discount … I have talked with and think highly of all the independent manufacturers in the area so when you are down to final choices you would be choosing between “good and good”. I would take things on a mattress by mattress basis and choose a mattress that is the best match for your personal value equation.
You are fortunate to have some very good options in the area 
Phoenix