All things being equal, the convention would be left hand on throttle and right hand on the stick which makes the ergonomics better for slipping to the left.
Perhaps in some types, but this is not universal. The pilot must adapt to the plane. My throttle is on the centerline ceiling, along with propeller, mixture, and carb heat, so it depends if you're sitting left or right side, as to which hand will be on the throttle.
With my right hand high on the throttle, sitting left side (normal), my right arm position makes the view to the left less obstructed, so turns to the left work out better.
I was discussing this with a learned colleague the other day, we agree that pilots look, and will allow an aircraft to drift/change heading, to the left, all other things being equal.