It depends very much on aircraft type.
In very light aircraft, anything over a slight breeze from the side will be difficult to handle with the crabbing method. Once you de-crab, the aircraft will begin to drift, and the lighter the aircraft and/or the stronger the crosswind, the quicker this drift will set in. This is more noticeable in a taildragger, because they are far less forgiving of a little drift than a tricycle. Because of that, I generally prefer the wing-low method.
Having said that, there are a small number of aircraft in which the wing-low method is not particularly suitable, because of engines, wing-tips or outriggers which get in the way. (If these happen to be very light taildragger, then being restricted to the crabbed style of landing will seriously restrict their crosswind capabilities, as is the case with the Europa monowheel.)
In addition, if we're talking about student pilots, many will find one method easier than the other. Since just about any basic trainer can be safely landed using either than crabbing method or the wing-low method, I would suggest teaching a student whichever method the instructor prefers. If the student has trouble with this technique, then try the other one, and hope the student finds either one or the other easy.
You talk about three methods. I assume the third is the combination, changing from crab to wing-low at very low level? From the aircraft's point of view, I don't think this is any different to the wing-low approach. But from a student or low-hours pilot point of view, it may be either easier or harder, so it's probably a useful tool for someone who has trouble getting to grips with the other two methods.
Just my personal thoughts on the subject....
FFF
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