I have both and I can't see any difference in the light output. I'm sure a light meter could pick one as brighter than the other, but my eyes don't see it. The Glock light does have a flatter shape to it and so lies in a drawer flatter, but that's a small point.
If I was buying another one, or replacing one I have, I would go LED next time. Battery life is short (about an hour), and the batteries and bulbs aren't cheap. My understanding is that the LED lights last forever and they are easier on the batteries although not as bright, but I have no experience with LED weapon lights, only flashlights.