I guess it's all in what you want - flood or throw or balance. I found the XP-G to be a pretty good balance with good runtime at only 1.4A (vs. the XM-L at 3A). Did you see my XP-G Neutral Mag beamshots here? There is a shot of the KD C8 XM-L to compare to as well as a modded 2D Mag (running 2 18650's) using DX's 52mm XM-L drop-in. That 3C Mag is also using the deeper Mag LED reflector. I was shooting for max throw without being pencil beam along with max runtime and minimum weight. Currently testing use with AA NiMh's in C adaptors and really working out well.
-Garry