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Skarmory, for its looks (I don't use steel pokemon in battle, so I wouldn't know how each of them compare for stats). It's one unique and awesome bird.
Metagross is my favourite steel type. It has got high attack and defence, as well as a psychic type to cover some weaknesses like fighting for example.
Metagross for battle, Steelix for awesomeness and interesting looks, and Aron for being so darn cute. I mean, look at it! It's so adorable! I want one for a pet! I also kinda like Scizor's looks and it's bright red, which is cool.