If you had a duel among those two, G-10 would beat the hell out of D-9 every time.
Ahh, but the stats board lets you select model vs. model...
Tour 30:
Bf 109G-10 has 179 Kills of Fw 190D-9
Fw 190D-9 has 218 Kills of Bf 109G-10
But, and here is the rub, you can't draw any conclusions from this at this or any other number. The arenas are not controlled tests where we know enough about the conditions under which these encouters occured to draw any useful info from the stats.
For me, it is easier to get kills in a FW190A-8 (I'm not very good but am 22 and 10 this tour in the A-8 so far) than in the Bf109G-10. The 190A-8 has a simple set of rules I can fly and live by:
1) Don't furball.
2) "Extend" if you run into something higher.
3) Pick your target and stay with that one target.
4) Lead turns and snap shots are your friend.
5) A good speed to engage is 400+!
6) Use the 190's roll to turn with the target until you drop to 300. If you don't have the shot by then go to a gentle left turn and climb.
7) Try to keep enough altitude that a snap roll to inverted and then an inverted 1/2 loop will get some distance between you and the inevitable P-51 or LA-7.
8) When to enter the fight, you should already be pointing in the direction you will "extend" to.
The 109 has troubles with 4, 6 and 7 which, since my ACM is very poor, makes its enhanced ability to do 1 moot.
My $.02 worth.