The company I flew for didn't care - it was simply left up to the crew. SOPs recommended Flaps20 for significant crosswinds (landing Vref higher so more effective rudder control), and Flaps20 are better in the event of a go-around (improved L/D penalty than Flap35). We would tend to use Flap35 more than Flap20, simply because the manufacturer made the facility available - silly not to use it (unless good reason).