My basement windows are roughly 2'x3' (h x w) and the exterior sill is 6 inches above grade, and 5 feet above the basement floor. I am not particularly concerned with security beyond frustrating the casual housebreaker.
The three styles of windows that look good in a horizontal alignment are: Awning, Single Tilt Slider and Double tilt slider. Does any one have any particular advantages in the above circumstances? Or do I just let my wife pick the pretty ones?