I never buy a car in it's first year of production.
The Mk6 owners are reporting faults already, it might be wisest to go for the Pirelli.
This is not uncommon for new models, although the MK5 GTI apparently wasn't too bad. The initial UK launch cars had hardly any faults/issues on them, despite the torrent of abuse they received in the hands of journalists.
When I spoke to my mate (VW technician) about buying a MK5 GTI his opinion was to go for it because it's pretty much bullet proof if you look after it. In contrast the B6 Passat was an absolute dog when it was launched and it had endless electrical gremlins.
The best cars (IMO) to buy are usually the ones near the end of their life-cycle. By then the manufacturers will have seen (and sorted) most issues that can occur in terms of build issues and weak points.