Unless you're really pushing the envelope power-wise with aftermarket turbos, there's little performance gain between any of the aftermarket systems and a modified factory intake system (aftermarket turbo inlet pipe, snow grate removal and dremelled passenger side intake duct) in terms of power output on IS20-equipped Octavias. That said, aftermarket systems do look fancier/nicer and many open or semi-open systems offer nice induction sounds.
I'm not sure what other mods you already have, but you're better off saving your coin towards an ECU tune of some sort, as this will bring power and torque gains that are genuinely felt and are quite transformative to how the car drives and performs. The bang for buck ratio is off the charts vs intake mods.
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