Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,182
In economy, there's no point travelling all the way to IST and then back to Western Europe.
All airlines have their issues and all airlines treat non-elite Y passengers like cattle. Therefore take the shortest flight(s) with the connection least likely to mis-connect.