I'd not normally add my thoughts to a thread like this as a) they're irrelevant to anyone but me and b) pretty much the same as option a.
I'm pretty much a GTI purist but I own an R so it kind of muddies the water somewhat.
My first car was a GTI nearly 30 years ago and I've owned probably more than a dozen since alongside many other cars of a similar ilk.
The R was never a planned purchase, I'd hoped to get a Clubsport but unfortunately I can't stand the mutton chops bumper on it and I also think the rear spoiler looks a bit silly. From the front it just looks a dogs dinner.
Anyway, to the case in point - to my eyes the GTI should be the perfect blend of biggish engine (check), nimble handling (check), reasonable running costs (check), good power to weight ratio within smallish body proportions (check), subtle but sporty styling with unique features (check), classier than the mainstream opposition hot hatches (check).
All of these things are why it's such a big seller in the UK with our crowded roads and hills and bends and general lack of space.
The mk7 GTI epitomises that perfectly, it's actually better on fuel than an R than the figures suggest, especially when running it on 95RON making it significantly cheaper to run. It doesn't feel 30 odd percent down on power to an R due to the high torque and very broad power and torque bands. I'd have put money on mine having significantly more power than 230PS and I'd put money on my R struggling to make 300PS. I've owned a lot of modified GTI's and so I have a good feel for these things.
I don't care what anyone says - the GTI and to a lesser extent the GTD looks really 'pretty' in a sporting sort of way; with Santiagos added (a poor value option but adds infinitely to the car's looks) the GTI is a really sharp and up to the minute looking car.
The R has a certain menace about it looks wise but... well let's just say it lacks the R32's and mk6 R's presence.
The mk7 GTI kind of reminds me of the mk2 8v GTI in that it performs massively well in its own right, and looks pretty darn good too, but lives in the shadow of another. The main difference being (aside from the mk2's better build quality and the mk7's impressive standard kit) the mk2 was in a bit of a heyday with a massive proportion of Golf sales being 8v GTI's similar to the GTD of today where as the mk7 GTI is a little too buried in the range now. This is the age of the hyper hatch with the owners of big engined big cars downsizing to the likes of the R, the A45 AMG, M135i and others who bring their own bit of snobbery with them.
The mk7 GTI over performs for its spec but underperforms in the sales charts, especially considering the cachet those initials have, lease gate has amplified that as everyone (and I mean those who don't inhabit this forum, rather the wider petrol head world) now thinks of the R as a cheapish option and expects the residuals to be low thanks to the twenty billion base spec lease cars that will all hit the market at once (which is the perception on quite a few forums) which sort of kills any image of aspiration or class.
So, my thoughts on the mk7 GTI (having owned one for around 20 months)?
I'm far from the typical buyer and even further from the typical R buyer, if you added all our household incomes together we'd probably still not make one higher rate tax income out of it. I'm not a career high flyer as I have a fairly low paid and low stress job that I actually enjoy so therefore passed on chances of moving on for years so much so that my ship has long since sailed. I did things a bit of a different way to the current general way of living in that I worked hard young and paid my mortgage off, kept my smallish house and spent my money on half (quarter?) decent cars and holidays. I don't even have a credit card.
I then stuck my savings into a bigger house rather than buying an R8 to park outside of a terraced house! Unfortunately I could only have one or the other I think as I live in an expensive area with something like 40% of jobs below the living wage but house prices at home counties levels.
So there's definitely no R snobbery attached to me, no feelings of trying to climb the social echelons and certainly no trying to keep up the the Joneses as they'll always go one better.
No, the GTI in mk7 form is something I'd not even have dared dream about back in the day when my hair wasn't more silver than anything else. It's an amazing car. I loved mine but...
... but the R does so many things a little bit better!
The main killer for me was the lack of stage 1 tuning options for the GTI and for those that did tune theirs, a few of them blew their drivetrains up!
The tuning box was an answer to tuning problems but not THE answer as far as I was concerned (yes I spent a fair bit of time trying one then not using one, then trying it again) so in the end I decided the answer laid elsewhere.
I bought an R and couldn't give a rats arse about tuning it as it's plenty quick enough and has a much sharper throttle response (once past that ridiculous dead travel spot that makes a pedal box essential in my eyes).
If it was as easy to do what I wanted to do with a mk7 GTI as it was in previous generation cars (that didn't suffer TD1 issues or lighter but weaker suspension components) then I'd still be very happily running mine...
... well probably anyway.