Dear contedicavour
Unfortunately you are wrong. 8 of turkish type 209 are 1400ts and are much more capable platforms than the older 209s of TuNavy and Greek Navy. The latest 4 U-209/1400s (one of them is still under construction) of Turkey are in the same class of Type 214s in terms of mission capabillities except for the extended operation given by AIP.
Its still not clear what torpedoes the Greek 214s will use yet since theye didnt select a new generation torpedo for their subs yet.. I also read several articles that the sonar is also not selected or not operational.. Fantasma can fill us with more information here..
The latest Turkish Type209 1400s use DM2A4 already for some time which in the future might be selected for Greek 214s as well since its a better suited torpedo for a German submarine
..The other 4 Type 1400s which are also quite modern use tigerfish torpedoes.
Each navy has its own operational requirements. I cant comment on what other countries do, but Turkish Navy sees SSKs as the major attack weapons in case of hostility since the ASW capabilities of the possible threats around Turkey are relatively weak.