This seems to be 50/50 split on my350z. Short ram is likely to have less pressure drop but is also prone to heat soak. CAI is the opposite. I'd try short ram (easy to fit) then CAI and see which you prefer.
I'm currently trying to decide on whether to get a BMC CDA intake or not. They get really good reviews on my old Leon forums (and all VAG), and Alfa's use them a lot too, as well as a few race teams and bike teams, but then arent seen on Zeds very often. Think I'll start a new trend