I chose the Pro's. I wanted the ability to adjust in more whites. The Blue are designed to run the ATI blue+ at full intensity. No need to select the blue+ from the templates, just runn everything 100%. The Pro's have more white LEDs and can be run to emulate blue+ by selecting the blue+ template but will loose some intensity. Then one can adjust in more white as desired. The blues can be adjusted more white but as in the pro you will loose a bit of intensity. However, "loosing" some intensity in either of them is not really going to be a loss per-say as they have over 200 watts of power (XR30) and more than likely you won't be running anywhere near full power unless you have a 3ft deep tank. Blue= 205w, Pro= 215w.