I’m very much invested in TK and have little experience in dealing with major problems with other carriers. IMO, it all comes to comparing the service you get from one airline to the other. I heard that some airlines are also difficult to deal with. For example, there are numerous reports that UA award ticket in J on TK metal doesn’t provide any baggage allowance due to an IT problem with UA. This issue has not been fixed yet although many complaints with UA and their support usually does provide a solution.