You can check the forums and it'll say the same thing your asking . It comes down to personal reference ,everyone (including myself ) that I run with in our 3rd gens we run NGK . Just make sure they are dual pronged and gapped correctly and you'll be just fine .
Use NGK iridium and you will have no problems.
I went with NGK iridium's. The "book" says they should be replaced at 100k. I mostly didn't want to have to fight with them at 100k miles to get them out.
I run usually one of 2 brands. Brisk or NGK both iridium. And both are 1 step colder than stock.
Last time I went Bremi coils and NGK Laser Platinum plugs.
Installed the NGK rs7 plugs and it runs fine. I kept them at factory gap, which was, if I remember correctly approximately .028.
I just hit 40k miles and went with the NGK (RS7) plug gapped to .024, and the RS3 coil pack upgrade. The initial results after install was underwhelming. Car ran a tad smoother, but that's it. Since the benefit of the RS3 packs were to provide a more intense spark, I tried a wider gap ~.028-.030 Man it woke things up! Revs "effortlessly" and pulls hard from top to bottom.
Bottom line: you can't go wrong with NGK. Can't really go wrong with OEM Bosch either but I'd just stick with NGK and make sure you gap them right, call it a day. I'd avoid Denso.
I run RS3 coils with RS7 NGK plugs in my Unitronic Stage 2 GTI. These things really are unnecessary for anything stage 1.
I used the NGK plugs once and kept getting a pretty bad hiccup under hard acceleration.
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