Personally I have no experience with smiths or taurus, but I have a 6" gp100 and love it. I bought it used but in like new condition. I installed a Wilson Combat spring kit and a set of fiber optic sights and it shoots like a dream. I've got less in it with the modifications than I've seen used smiths go for and I personally like the looks of the gp better. Mine is also the full underlug model, which is my favorite. Good luck with whatever you decide.
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