As mentioned, the Vararam Air Grabber is the only CAI for these trucks that will actually give any performance gains. The others are for looks and sound with the exception being the Volant with the lower scoop. That one actually decreases the intake air temps a bit. Other than that it's about the same performance as the factory air box.
I've bought and sold a bunch of intakes for my truck over the last few years. I've had the Vararam which I loved the lower air intake temps and the performance of, but hated the fit/finish, the new model S&B which I felt no gains over the factory intake, the older model S&B with the lower duct which again I felt no gains over the factory intake, the lower airbox from the Ecodiesel/6.4 trucks with the 6.4 Mopar filter, and finally I have the Airaid Jr that was mentioned earlier.
Take it from someone who's blown a lot of money on intakes for these trucks, the factory airbox with the larger lower half and filter is about as good as you're going to get with factory level filtration. Plus the factory intake comes out super easy to work on the truck if needed. Try that with the newer S&B intake.
A lot of guys run the Vararam with great success and honestly it's the only one that's worth the money. I just had problems with the filter popping out and dust getting in.
Hope this helps!