Functional Power vs. Powerful Looking

Four videos are brought to my attention:

1) Choy Lee Fat - to me, each move is incredibly powerful. Probably one of the best looking one's I've come across. That said, i'm not CLF expert.

2) Choy Lee Fat - this one is bag work using CLF moves. New video to me, interesting to see how power is released into the moves.

3) Wing Tsun - many of you have seen this before. Fast hands.

4) JKD - I'm sure many have seen this one too.

Now which ones do you think can actually throw powerful hits or just look powerful on video?

Until then.