Flying to Antalya

Hi- made up mind as to where to go on holidays- Turkey. I have 2 choices for the flights. Belfast with Thomas Cook or Dublin with Onur Air.

According to my research it will be cramped with either, but any suggestions as what would be a better (or less worse) choice ?

My sisters use Turkish Air from Dublin, changing in Istanbul (in summer). They like the service on TA. One sister is quite large! Slim