But in a balanced turn the higher wing will travel furhter therefore having a reduced angle of attack. (Just thought I'd complicate the arguement )
In my experience it depends on lots of things. Does the wing have wash out or wash in? Is the aerofoil symetrical throughout the span? Has the aircraft been bent in the past? Does slipstream have an effect?
Of our club aircraft, two have 23,000 hours or more. They are in very good condition considering, but they do not dispaly uniform stalling characteristics. Another type I instructed on always rolled in the direction of engine rotaion. Another type always dropped the lower wing, another always rolled wings level. And one glider I had the misfortune to fly always entered a spin if the wings weren't level at the stall!
Try it and see, don't rely on the theory as it often fails to oblige.