I chose the Airaid because I was told by someone that had tried both the Airaid flowed better. I don't know about filtration, but
I would think both filter better than stock, and that is good enough for me.
I didn't think that changing the filter was going to give any noticable power gain, I installed it for economy and egt's, but IMHO it did make the truck slightly more responsive, an unexpected suprise.
I would think that they all are fairly close, heck lots of guys have even made their own!
Someone out there should know the filtration microns/cfm of each unit.
PS. The Airaid replaced the top of the stock airbox to form a heat sheild. Not sure of the others.
JRG