If you can justify the extra cost, the Sony 58 is the better unit - it is more powerful (GN=58 rather than 53) and also has the ability to swivel the whole flash - for when you are shooting in portrait mode.
For the money the sigma is a great value option but if you can afford it go for the 58am you won't regret having the extra power and faster recycle rate. The portrait mode is also icing on the cake
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