I went with the Mossberg and so far am very pleased. Got an IC 385 today from a good buddy, and am sighted in and ready to go. Other than a little bit of creep in the trigger, I'm really liking it a lot so far.
I think the TriStar has better features with the pistol grip and 24" barrel, but I heard enough about the heavy trigger that I just decided to go with the Mossberg. If I had more time and money, I probably would have gone with the TriStar and gotten a trigger job done, but youth weekend is next weekend and my daughter needs a gun after the nonsense with the Stevens 301 and having to send it back.