They are two different tecniques, in mounting deer hair onto the hook.
Stacking the deer hair (in a stacker, to align the tips), then tying it in is mainly for wings (i.e. elk hair caddis dry fly...no spinning of hair is involved to finish the fly off.)
Spinning involves taking a bunch of deer hair, combing out the fibres, and then spinning it onto your hook shank. Then trimming it with a blade to shape.
So, I dont quite understand your question about preference for one...they are two different methods, to achieve very different results. There is of course a use for both, with different flies.
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