I have a GTI PP at the moment and have done 30k miles in it.
Whilst it's a good car and is iconic, it is just another hot hatch around the same power and speed as the fiesta, focus, clio, Octavia, Astra blah blah blah
If you're happy with that, get the GTI it's a great car....
I get my R next week........because I want something understands (except the quad exhausts) and something that most people don't know, except those who know cars.
The R stands out in a different way to the GTI, not to mention is much quicker, sounds nicer and has much better traction.
Whatever your choice you won't be disappointed, unless you buy a GTI and pull up at the lights next to an R.