What is the Best Aircraft that Turkey National Airways operates?

You Decide 

If you refer to efficiency per seat I have voted for A320-200 and 737-400. If you refer to the aircraft I would most likely operate in game it would be 737-700 and A320-200. If you refer to the aircraft I would prefer flying in real life it is still 737-700 (if sky interior) and A320-200. 

Why do you need this data? 

I just want to see what other people, prefer i terms of aircraft, before I decide upon what aircraft i will chose to expand my operations with. 

You should choose the aircraft that suits your requirements, not what other people like

I dont see any different in profitablity between 320 and 737s. IMO it is a matter of personal choice. I like Airbus so most of my airlines use 320s. But 737s are better in two aspects first it offeres a cargo convertible version and second its larger 737-900HGW has more range than A321H.

You are missing 738, this aircraft can be configured with one more row of economy seats compared to A 320.

Also 734 is more economic than 733.

73G is more economic than 319, and 321 is more economical per seat than 739. 739 is more economic overall and 739 HGW flies farther.

737 ER is more economic than 319 LR. A 321 neo heavy will be very competitive to 739 HGW.

So best approach is to operate both Airbus and Boeing narrow bodies and use the appropriate maintenance provider where additional maintenance category does not add much additional cost.

You are missing 738, this aircraft can be configured with one more row of economy seats compared to A 320.

Also 734 is more economic than 733.

73G is more economic than 319, and 321 is more economical per seat than 739. 739 is more economic overall and 739 HGW flies farther.

737 ER is more economic than 319 LR. A 321 neo heavy will be very competitive to 739 HGW.

So best approach is to operate both Airbus and Boeing narrow bodies and use the appropriate maintenance provider where additional maintenance category does not add much additional cost.

The selection is only from types that Highlander operates... Otherwise I agree that it is a pretty weird selection.

734 BGW is very economic machine then.