Hmmmm - I just went through the same dilemma while planning for a build for a 10G nano. I chose to go with the buckpucks. I chose to use external potentiometers - thinking that it would be easier to manage dimming. I bought only one power supply, and will add a couple of switches to turn off one color or the other. I couldn't seem to locate pots with switches that seemed appropriate.

The last of the components arrived yesterday, now I have to start the build.