Flowguard gold vs regular CPVC

I've seen one post asking this question via a google search, but the thread went off in another direction and noone answered the question. But I've seen at my local hardware store two types of CPVC being sold. A no name CPVC and then there was FlowGuard Gold CPVC. My question is what is the difference between the two.

If I was ever going to install CPVC flowgard gold is what I would be installing.