I assume you are referring to MA use, in which case the G-6 is probably the worst choice of all the 109's. He has no advantage over the typical MA aircraft.
Since it seems like you want something that turns better, try the G-2 or F-4. G-2 turns well and can climb better than most MA opponents. The F-4 turns even better, but it lacks the engine power of the G-2. Without gondolas, the guns are the same in both. Just avoid a turn fight against the usual turn fighters; Zekes, Brewsters, etc.
The gondolas add significant weight and drag. If you think you're likely to encounter bombers or Jugs, they will probably prove useful. Context is everything.
Learn to use the flaps. They are critical in 109's. Flaps can be deployed under 200 mph. They are especially useful at gaining angles at the top of a rolling scissors.