Depreciation on a £35-45k GTR is non-existent. I bought mine, sold it 2 years later and could buy it again now (another 2 years later) all for the same price.
Servicing etc would cost a few hundred if the cars just had the big one. Tyres are under £1000 and you wouldn't need new brakes unless you were tracking it. At most new pads which are £250 per axle. If I wasn't using mine on track I wouldn't have gotten through a set of Cup 2s just on the road for a good while.
If you want to buy a car and not lose money on depreciation I'd be going for a GTR. The market bottomed out a few years ago and hasn't moved since. Every face lifted version gets more and more expensive which keeps the older models above £35k.
Ah come on, don't try to convince me man, I need to be sensible haha. Think of the fuel I will save in a Golf R!
What is really bad I've found a stunning GTR which seems exceptional value and is a clean car, as had it checked out by Kindai and its a very good price its listed at, if I can get another 1-2k off then its a real good buy problem is I really also want to try a Golf R as I remember driving a 2.0 TFSi Sirroco or whatever it is called and though it was pretty dull and boring, it was exceptionally nice to drive and quite capable for a FWD hatch.
As I said I like a GTR because its a GTR, I've had one for a weekend and they are epic, though its size but mainly the speed you have to go to enjoy it properly was not ideal.
I like the Golf R because its smaller (hot hatch or hyper hatch is it these days?) and really quite a good car to throw around on narrower lanes and it has the advantage of costing around 1/3-1/2 in fuel, tax and insurance in comparison. In theory the money saved means come March next year I can just pay the full 50k for the new Mustang in cash, pretty much gonna be around 50k I reckon due to selecting all the options.
A GTR will cost me 35-40k, will probably sell it for 35-40k, though if I need it gone quick then I would maybe have to price it under others in the market to make it shift faster, something to be prepared to do.
Golf R will cost me 18k, will probably sell for 16-18k.
So depreciation wise they are both similar, its just down to running cost and whatever maintenance bills they throw up.
I was also considering an RS4 but pricing is very hit and miss, seen some cars at 12k and others at 30k, chances of getting a great one around 15k is slim and then trying to re-sell it looks hard, being monitoring RS246 and other various forums, private adverts and they are not moving unless sold at bottom of the market around 12-13k.
I've also being looking at C63 AMG, dismissed it because stupid, very stupid, don't need another V8, got one coming and an AMG in Winter, be as useless as the Mustang was on a freezing icy day.