Wow that's a really open question, everyone's going to have their opinion which would usually side with whatever one they have on their car. Forge have a Twintake system but very expensive, Revo is hugely popular but from what i can remember it was over £300 I think, or around that price mark.
I don't think there really is a "best" one. In my opinion, it depends on your budget; i would probably go for one comes with an intake pipe attaches to the turbo rather than literally just a filter head / cone.
I had a NeuSpeed p-flo and it sounded great and had great benefit in terms of power, I was patient and waited until it was a Black Friday deal and I think i bought it for £150 ish.