[aerohead]

I suppose you need to decide where you're going with the car.
If you're looking for limited length,choose the sedan.It will have great rear vision.Easy access to the trunk.Easy parking.
If you're thinking about remarkable drag reduction,go with the hatch for long term benefit.It is the better candidate for low drag through elongation.
In the long run,it's better idealized for the sectional density necessary for truly low drag.
There are no truly low drag notchback sedans.There never will be.