The AquaGlo is better at highlighting the colors you're interested in but is quite dim. The powerGlo will also highlight the colors your after but not as much so. It is however a much brighter bulb so your tank will be better lit.
With that said I very much like both of these bulbs for doing exactly what your trying to do. I have 2 48" PG's and 2 24" PG over my 125 and it makes my fish look fantastic. Even my Hoplarchus look very nice and they are a green fish. Look at the green color on the face of the fish in my avatar.
Another great bulb for highlighting reds, oranges and yellows is the AquariLux bulb from PennPlax. There again however it is not terribly bright.