Bringin' obstinacy to new levels...
Let's assume we have two airplanes, 737 and A320, and there is sudden nuclear explosion at place relativelly close and equidistant from each of the planes.
A320 gets his FBW fried and spins out of the skies uncontrollably.
B737 gets his electrics fried and yes, it can glide, and yes it can lower its gear and yes, there's manual reversion but WHERE THE HECK WILL YOU BE GOING NOW IN 737 WITH NO AHRS, NO ADC AND NO STBY INSTRUMENTS EITHER (it's all solid state nowadays)?!?!?
Short answer - earthwards, rapidly.