Flap 3 will be preferred config as environmental aspects come more into the play. Emission charges will drive the industry towards low drag low noise approach techniques along with CDO. Nothing wrong with F3 as it gives lots of advantages as mentioned before probably most significant one being improved go around performance along with higher energy during approach. One can argue about better controllability through higher approach speed and easier handling of de-crab. Unless circumstances dictate otherwise I don't see any reason not to use F3. Such circumstances might be tailwind, LDA, RWY status etc. F3 is a good overall compromise
