I think the problem you run into with snap kicks towards the head is that they don't have much punch. I find them alot easier to do, but you lose so much energy getting your foot up to head level that the blow's not going to be very painful. A MT kick to the head, on the other hand, has the full force of the body behind it and, while its power is still diminished it has enough to knock a man out.
Keep in mind I've never been hit with either kick in the head, so I'm not sure of the effects, this is just theory from trying to kick at that level for both.
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