If you do a fair few miles on daily commute and at weekends, then go for a 1.8T. Plus if tuning is your thing, there seems to be more options.
I've got a V6 4mo. That cost me £80 to fill up the other day and won't last long on a long trip

. But I'm only a few miles from work, and the 4wd is a bonus where I live when it snows.
Like previous poster says, the 1.8T came in 180bhp flavour, which on paper is not far off the V6's 204bhp. In real world (sensible

) driving, would you notice the power difference? I couldn't, but I'm no Stig. V6 does sound better though. Anyway, there's few places you can find out these days what with cameras etc, unless you go on track days, but then again the V6 is setup more for motorway cruising than cornering.
The V6 is probably a little more on insurance too depending on your circumstances and insurer.