Personally, I'd go for the new GTI.
R32 is more of a fuel guzzler and has a silly road tax rate (£400) due to high emissions. Might be harder to sell on due to global scaring

I guess both cars should be worth about the same in 2 years time, but no car has cast iron residuals. New Mk VI Golf will also impact when it comes out next year or so.
Audi TT is probably the better bet for (perceived) exclusivity and residuals though.
Simple really. Buy the car you like the most and which gives you the best driving experience. My vote goes to the GTI - better all rounder by far and much more rewarding drive than the TT I previously owned
