my company's SOP's dictate to use F30 in gusty conditions,F 40 are used in short runways and/or high weights.Don't forget that F 40 give a tremendous increase in drag so F 30 are preffered in windy conditions as there is more thrust available for acceleration.
I couldn't agree more with the other gyus and especially with A37575,no one is allowed to make suggestions or speculations of his own.Also my dear friend keep in mind that if you attempt a landing at the notorious airports (for their windy conditions)of Rhodes,Heraklio or Samos with only Vref+15 and not Vref +20 or flap placard speed- 5 (whichever is more limiting)you could find your self in trouble........