The outlets usually have older styles and some newer styles that were once on sale and now moved to the outlet. To my knowledge Gucci does not have outlet bags that were made specifically for the outlet, so the quality is the same as retail...but I could be wrong.
I have been to a couple outlets, I get all excited and then when I get there it isn't as great as I had hoped. I think their annual sales are better, and NM will have the same items marked down even more. If you're just looking for something small like a wallet or sunnies, you should find something nice.