Definitely go anodising, spend time and clean it up nice and get out all of the scratches and work it until you get the finish you want, Hard ano is by far the better option over powder coating, If anodising chips off then its not hard anodising, make sure you tell them you want industrial hard anodising not just decorative. Decorative is just that and has almost no resistance to weather or sunlight. Hard anodising becomes part of the surface of the aluminium and can not chip off. Find a reputable anodiser that knows what you want and won't just fob you off, took me a little while to find a good one here in australia but its worth it.
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