Debbe,
I sell mostly all glare flavored Conservation glass. I have very little call for Reflection Control glass and don't stock but one box of 32x40 just in case someone asks for it.
I am right on the Gulf coast and the intensity of the sun here seems to be much greater than anywhere else that I have hung my hat over the years. So I push CC glass strongly and would advise others to do the same.
Glass is probably the least expensive of the visible materials used in a framing package and it isn't the place to take shortcuts to get the price down for a customer, in my opinion.
Framerguy