With tailwind components greater than 10 knots, I'll typically land into the wind unless I have no other choice. So runway 14. 12 knots is a pretty stiff tailwind, even for the Pilatus.

Also, if you look at the landing distance performance charts in section 5 of the POH, the charts only go up to 10 knots of tailwind. While not listed as a limitation in section 2, I considered it one since anything above that is uncharted territory and a specific performance can't be guaranteed.