They are very comparable pistols. I favor the 509 because it fits my hands better and sight acquisition is quicker. It;s kinda hard to explain but I'll give it a shot. It fits me more like a tailored suit than an off the shelf suit.

both great guns since you already have a FN I suggest that you go with the Fn509

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Hi Jerr, FN makes a very nice firearm. I have the five-seven and love it. I love all my Sigs though too. In this case I'd have to go with the FN though and thats hard for me to say because Sig makes such a great firearm.