7K+ hrs operating the 757 out of a windy gusty base albeit with ample runways, I prefer to use flaps 15 to reduce the t/o roll. Flaps 20 I only use when required by runway length.
I am not a fan of using flaps 25 for landing, although at high landing weights (high Vref) with the bug speed with approaching 160 kts (20kts increment for wind and gusts) and the potential for flap load relief if you use flaps 30, is the time to do it.