I love my 9mm AR, I also love my Kriss Vector. Two completely different firearms that do the same thing.
Kinda hard to tell you which is best. Only you know what type of shooting you do, where you shoot, if non restricted is of any concern, what you like the looks of, how much you're willing to spend.
See where I'm going here? They all do the same thing in a different way, best thing to do is find an indoor range that has rentals and try them both or just talk to guys at the range and hope someone will let you try their gun.