I say you can't go long with either. You can easily upgrade the 6P to a 9P with an A19 and P90, but the G2 is lighter and, being constructed of Nitrolon, will wear better. The metal body of the 6P is susceptible to dings and dents -- that won't happen with the G2. It's been said that dropping a 6P spells the end for the lamp assembly, but no problem with the G2 -- since I've only heard one report of this, I can't say either way whether it's true or not, but there is no distinct disadvantage to buying the G2 over the 6P. In fact, there are several advantages, those which I outlined above, and it is also a very nice light. But some people have a stigma against plastic lights, and I wouldn't blame them -- in general, plastic looks and feels "cheap;" however this is not so with Surefire's Nitrolon blend of fiberglass polymer.