The LBZ MP does the same thing as the AFE MP. The AFE is just a way cleaner finished look and a direct replacement, where as the LBZ MP requires you to cut your factory intake tube and splice them together with a silicone coupler
it's cheaper lol. The AFE piece flows slightly better from what i remember reading, but it's only a small amount. It's completely up to you on which you decide to do. And actually, you might have less install issues with your airraid intake if you get an afe piece since it was intended for the lly. Didn't know you had an aftermarket cai until now.
What Rob said. The stock MP is very restrictive and can cause overheating and mediocre performance, especially if you are EFI'd. AFE Bladerunner (~$200-$250USD) is good and installs without modifying or cutting. LBZ MP is cheaper ~$80-$100USD) and requires some air tube cutting but works just as good, some say even better. I'm happy with the LBZ piece, but the AFE part wasn't available when I did mine, otherwise I woulda got it.