I'll be succinct.
Question 1: What car have you got?
Answer: Golf GTI.
Reaction: Eyes light up and there is a look of envy.
Question 2: What car have you got?
Answer: Golf GTD.
Reaction: Blank look, no reaction.
Life's a beitch.
QED. 
I'll be more succinct.
You overrate the Golf GTI's impact.
I'm as much of a VW fan as the next person on here, however, I feel no envy, or animosity towards people who on mk6 GTI's. Sure they are a nice car, but not something to be envious about.
A car to be envious about is something like an exotic sports car Lambo, Ferrari, Bugatti, Rolls Royce etc. Hot hatches are ten a penny now, and every main manufacturer has one in its line up.
Ultimately to the OP, if you want a GTI for its spirited drive, good build quality and comfortable drive then get one. If you want a GTI for it's perhaps not quite as sure footed drive (due to front weight) good build quality and comfortable drive then get one of them.
It also depends on how long you intend to keep it. High milage on the GTI will affect resale value, on the GTD it won't harm it so much. Servicing costs on both will be higher due to VW method of working, although running costs on the GTD will be lower in terms of fuel and tax.
Economies of scale, which can you afford?