There should be no one size fits all method. It depends on the aircraft and the conditions.
High wing Cessna's particularly the ones with the 40 degree flap setting do better with less flap. I generally use 10 degs for these aircraft when landing with a significant crosswind.
Low wing aircraft that have less effective simple slotted flaps, like Pipers and Grumman's, do fine with full flaps in a crosswind and thus I use full flap for every landing in these aircraft
The approach speed is condition dependent. I use a normal approach speed in strong but steady winds, but add 5 knots for gusty unsteady wind days.
Last edited by Big Pistons Forever; 3rd Jun 2013 at 04:38.