Harry's post appeared while I was typing mind. Everything he says is true, with one small qualification. With full-scale taildraggers, some pilots prefer a sideslip on final (with the wing down on the side from which the wind is blowing) to crabbing. The reason is that slipping lets you keep the fuselage pointing straight down the runway through the whole final approach, which in turn reduces your chance of a ground loop. With models, as Harry says, crabbing is much, much easier. (It's not because models fly differently than full-sized planes, its that when you're sitting in the cockpit you can know exactly what your bank angle is and you can tell, much better than with a model, if you are lined up straight.)