G&P's feel much better to hold, the G&G's externals are average, but not great. The G&G will however shoot better- thats not to say the G&P rifles are bad by any means.
Of the two, I'd go for a G&P. Internally get a new hop rubber if you really feel you need it, but it'll be good to go out of the box. It's also worth considering a VFC too.