Matter of priorities really. How high up is the driving experience in your list and what are your expectations from the car? If you want to enjoy spirited drives at best then the PP is a must. It is definitely felt and appreciated without going nowhere near a track. It will not be apparent during the typical daily driving of-course, but whenever you have some "space" to push the car you will see how it can positively surprise you by keeping to its track and build speed earlier than expected without the, typical of powerful FWD, wheel-spin or understeer drama. It's very good in fact and for me the GTI shouldn't even be offered without it. Every other FWD hot hatch in the market comes with a lsd as standard nowadays. The non-PP 7.5 would probably be a bit of a cooler place to be in due to the active info but less satisfying during those sporty drives.
The biggest appeal of the 7.5 is probably not even the infotainment or tail-lights but knowing you're buying the latest model. I accept to some this can be a really important factor so not gonna argue on that. However, a facelift is not actually a new model or next gen in the sense someone compared an iPhone 5 to an iPhone 7 (let alone 8 and 10). It's nowhere near that in fact.
Personally (and that's just my opinion ofc) I have always been against facelifts regardless of model. The way I see it, just as the prices of the original car have come down and I can get great deals, I am asked to pay again the original full price of a car that is essentially 4-5 years old (its technology, not the car obviously) and at least at 2/3 of its life already. I can understand paying a high price during the first year a model is released but not 4 years after, when there are actually brand new offerings from the competition. I do think though that the facelift concept is genius on the dealer's/manufacture's side. And there is also the depreciation aspect. Being much closer to the end of its life, prices are going to drop quick and big when the actual next gen model comes out in say 2 years from now. I don't think there is going to be much between a 2016 mk7 and a 2017 mk7.5 when the mk8 will be out.
What is the price difference between the two cars you're looking at?