Though I do like British Airways, KLM and Singapore airlines.
Emirates, Etihad, Qatar....these ones tend to be expensive , so not so bang for your buck imo.
For most amount of travel thus far, its been Air Canada for me, simply by the economy of scale they have for going to/from Canada (and within it). Though I give them fairly good rating on it....I have never had a bad incident yet.
I don't have any specific preference toward any airline or any company in any industry for that matter. I do however will do my best to avoid some airlines (which include all US based airlines)
Qatar Airways, because they had the route I wanted to take with good price and nice in-flight food and entertainment. I think Turkish Airlines may have Melbourne-Istanbul flights, so I might fly with them next time depending on the price.
The quatar is a great and beautiful company, unfortunately I have never flown and I would like to try, I am unfortunately biased and vote Alitalia ahaha have you ever tried?