I chose the 
G70 because it's a better handling, more premium car and I personally like the look better BUT I certainly see the draw to the Stinger. The hatch is awesome and the Stinger looks great. I think it sucks Kia will discontinue the car.
One thing I want to say is the whole back 
seat leg room comparison is over blown. Yes, the Stinger has more room but they are actually pretty close. If stinger owners were 
really shopping for leg room, it likely wouldn't be on the list because it's not awesome either.. Let's be real here... is that actually a major factor in buying one of these cars? I think not. However, to be fair I rarely use my back seats!
Accord and Civic thrown in for comparison .
Rear Headroom - Stinger 37 vs 
G70 36.9 (-.1)
Rear Leg room - Accord 
40.4 vs Civic 37.4 vs Stinger 36.5 vs 
G70 34.8 (-1.7)
Rear shoulder room - Stinger 54.8 vs 
G70 54.6 (-.2)
Anyways, like others said you can't go wrong with either!