Hey man. Not sure what's with the intercooler responses above, lol. My mk6 knowledge only had us upgrading Intercooler when going K04 and was never brought up once until that unless you are in a heat soaked state/country.
With the two choices you provided, the diverter valve is supposed to hold the boost longer before "cutting" off. I'm not sure how beneficial it is on this car. I mean, I understand the benefits of having it, I just don't know how much it plays into the Mk7. I got it early on with my GTI probably while on Stage 1 and I can't say it made a HUGE noticeable difference.
The intake will definitely give you a nice sound but if you have a loud exhaust, it might block some of that intake sound. Something I did on the mk6 as I was told it wouldn't have any effect on the hood paint, is removing the under hood shroud cover. I did notice I could hear everything a lot more refined once I took it off... All a sudden the intake become a lot more noticeable when I was getting on it. Again, probably no noticeable increase performance with the Intake but the sound was worth the upgrade in the end and required for the Stage 1+ upgrade
Still have no clue on these cars yet as this is my 3rd post ever and did not prior research on them, lol.