Physics dictates that the difference between one CAI and the another, relative to the difference between any one of them and the original equipment, is almost certainly miniscule. I have a generic, $150 CAI for my Dodge Dakota, the cone inlet for it looks in size and shape very close to my much more expensive V6 Steeda. There isn't a magic machine inside those cones that make one much different than the other.
We have our preferences and bias, but until we see a dyno comparison of one to another on the exact same car on the same day at the same temp, there will be no proof of one better than another.
It's all good....I really like my steeda CAI with a BrenSpeed xcal tune.