Dark Room: Either 69F or 71F
Lit/Bright Room: 69F
71F has a glossy screen that may cause some glare issues for some but provides a tad better contrast ratio and better blacks due to the glossy screen.
69F has matte screen and will not have this problem.
PQ is about the same and very hard to differentiate.
Stop by a store near you if you can handle the glossy finish or not.
Thats about the main differences.
I couldn/t stand the ANY glssy screen in the dark showrooms, so knew glossy screens would be bad for my bright livingroom and got the 4069F.