Yeah G is rubber too, but an improved version.
I keep flitting between a G, a D and my GFB DV+. For me personally on my stg 2 ED30, the DV+ gives the best results in terms of throttle response and hanging onto boost, but it does need periodic cleaning / oiling. It starts to chirp coming off the gas part throttle to give a clue when to do it. Normally it's silent.