Buying a one year engine with limited support, limited parts is a bit of a risk.
I had great luck with my 2015 Jetta dsg... always got great mpg, great power, and was reliable. Only had a def hose(weeping under the hood) and a glow plug changed, both under warranty at scheduled MX appointments.
Others have had less luck...some dsg drivers having poor mpg, some people having numerous hard to trace issues that occasionally need parts that are backordered for MONTHS...and unfortunately the car WILL NOT RUN , since the emissions systems counts down miles till it will not start till fixed (or deleted) if you are into that.
Unfortunately some people are reporting that some dealerships are refusing service due to now hitting 10 years old.... unicorns sometimes need a well trained mechanic and dealership aren't apparently training TDI mechanics as VW has made it part of their history.
One year older might have less power, perhaps less MPG, but plentiful parts, support and much better understanding in the community.