On the widebody in THY, there are 7 to 10 consecutive days off each month which you won't have in EK. Istanbul, though not 100% European city, is a great place to live. The climate can't be compared with that of Dubai of course!
On the other hand, in THY there are some uncertainties regarding foreign FOs command upgrade and contract prolongation (EK looks more stable and secure in the long term, despite the long upgrade time).
Salaries in both companies are almost the same. But in EK you will get some other benefits such as company provided accomodation and education support allowance for up to 3 children.
I would say - a hard choice. Good luck!
My 0.02.
Last edited by Buys Ballot; 20th Jul 2013 at 08:22.