Virtually always left hand between 11 and 1. The steering wheel is even coming apart there on one of my cars because its the only place my hand goes. Big turns involve "the crank".
That's basically how I do it too. Nasty weather my right hand will find it's way on the wheel. I have noticed with both hands, tire grip is relayed much more effectively to my body and thus mind.
I can do almost any turn with only one hand quite easily with my truck and the way my steering wheel translates to actual movement. Some cars I have noticed it is more difficult to achieve one-hand turning, partially because I am less familiar with how the vehicle and wheel relays information to my hands.
I am keeping an eye out on future AWD cars that feature paddle-shifts, like the twin-clutch Mitsubishi Lancer Ralliart or Lancer EVO MR... though the latter is expensive as fuck these days for some reason... Subaru hasn't offered it yet (ever? keeping to the manual-only in most rally-inspired models). If I ever get an "auto-stick" / dual/twin-clutch car with paddles, it's going to be
strange adapting to two hands on the wheel, though I'll likely only do so at times of shifts, so stop-n-go mostly, long roads and highways I'd still be real comfortable in the seat.