[Tcoat]

Basic rule with these is that the later model year is the better choice. There were many small improvements made between 2012 and 2017 and some even bigger ones between 2017 and 2020.
Try to avoid any car that was heavily modified. You can never be sure of the quality of work that was done. This may not be as big an issue in Europe as over here though since you have much greater restrictions on what can be done.
Obviously if you can see service records that will help establish how well the car was taken car of.
The transmission are fine. Not great but still fine. If a manual you will want to have the throw out bearing checked as that is a weak point.
If you decide that you want the 12 (or an early 13) that has not had the spring recall done then just leave it alone and don't have the work done. There are almost no reported cases of the springs failing but many of the engine blowing after the recall work.