GTi Reliability questions

I am going to be buying a new mkIV Gti this summer and I want to know what is more reliable the 1.8T or VR6. Im not asking about power, or which you prefer. I want to know which version of the GTi has less problems. I currently own a mkIII 2.0 which has been virtually bullet proof for nearly 160,000 miles and I want to make a good choice on my next vw purchase. The different tuning options arent important right now. I just want a car that wont be going to the dealer every few weeks for repairs ?
Anyone have both cars that could comment and compare ?