I have an older 390 Silver Mallard with the wood stock. Very dependable gun and has never had so much as a hiccup for me. One of the guys I shoot with has a 391. I have shot his gun and didn't like the feel of the forend as it is very small to me. Other than possibly a different receiver profile and a somewhat diferent gas system, either should suit your needs.
The $550 difference would make up my mind on which one to get.
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