Mighty car mods did a myth buster on YouTube, quite extensive exploring all options, the only real way (in their eyes) to get a noticeable increase in power is to actually run a duct about 5 feet away from the engine lol.
It all really depends on your budget and what you really want to achieve, I paid too dollar for a custom ITG carbon induction but mostly for the looks. Panel filter will keep you looking standard under the bonnet and you may notice a very slight change in noise standing I front of the car with someone revving it. A cold air induction you will notice a noise difference and will also have a more modified look in the engine bay.
The most popular is an open cone filter due to the noise it produces but the heat from the engine will increase the air intake temperature and you risk losing power and fuel efficiency. This can usually be countered by using a heat shield but then again the effects are negligible.
In my eyes, stay standard, the stock filter is more than capable, unless you want to spruce up the engine bay then definitely go CAI