A few years back I had to do a ferry flight out of Sao Paulo with the LEDs retracted on a B-747-100. Even with low gross weight and greatly increased takeoff speeds Boeing told us to expect some buffeting after liftoff. They were right. I did many zero flap takeoffs with slats extended on the DC-9-30 and everything was pretty normal. So I'd have to say I would want the LEDs if I could only choose one.