Personally, I feel that the full Windsor is too much, too large a knot and the potential to look like a school chav. The half Windsor does indeed suggest you know better knots. The Four in Hand, however, is the most symmetrical knot in my opinion, and produces a nice shape.
I usually go for the Four in Hand myself, although I used to use a full Windsor (which I found too chunky on someone as skinny as me). The half Windsor has a nice shape to it though, and the Four in Hand can look a bit weedy if it's over-tightened.

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