Well me being a mechanic and MOT tester for a living I can offer some advice
The BMW's are known for turbo failure and some have issues with the bottom end of the engine I have changed quite a few turbo's on them not a bad job to do but will cost about £700 for a turbo.
The 2.0 VW engine does suffer with camshaft wear I've also changed a few of those in my time but I have a Golf GTTDi 150 myself they also suffer with camshaft wear but I slung a new cam,followers and lifters in that so will be good for another 100'000 miles.
Auto's are not my cup of tea they never have been and are normally more trouble then they are worth and if they play up you are talking ££££
Myself personally would go with one from the VAG group... Audi , VW , Seat , Skoda you will not go far wrong :)