Hi people, ive tried searching for my answer but cant find one

Ive got a agg gti 8v with the standard filter on at the moment but can't decide what to do.
Ive been looking at the pipercross air filters and panel filter as mainly i want to increse the performance abit more. So basically what im asking in terms of performance which is better a induction kit with a air feed or panel filter with a drilled airbox?
If anyone could tell improvements or losses they got from fitting either I would be very grateful.
thanks