Brochures,ease of use of controls,smooth verses slip-resistant acrylic(that's a personal preference),220-110 volt model(220 allows you to run pumps with the heater running,at same time),future chems,OZONATOR,maintenance issues,dealers availbility to deliver(through doors,craning,etc etc) future cost of repairs,and who performs repairs.
Probably more to consider,but think you have enough on your pallette,presently