... Politic doesn't even come into consideration. ...
This is the most naive thing I have ever red on this subject. I don't want to offend you but that is certainly not how real world works.
The main concern for Erdogan is making a political point. In the same meeting government also cancelled the corvette bid for 6 MILGEM corvettes. They had given it a company (Koc holding) but cancelled it because a hotel owned by same company helped demonstrators in recent Istanbul protests. They let protesters hide in their hotel or something. And the next day, Erdogan said, publicly, they will be "punished".
Erdogan, to the extend of his can, is using these two bids for political posturing. It is so obvious if you know Turkish politics.
Technical side and cost is just apparent reasons given to general public.
Now, don't get offended, hq-9 might be the best performer in the tests but even so that is not the reason for its selection.