If I had that question in an interview, to be honest no preparation required, tell the truth. I have 3 ATPL which affords me a few companies to look at. Regarding OSM , in Europe and the Far East many use these companies for work, PARC is a huge one and a friend of mine is employed with a Japanese carrier through Parc . Difference is , awesome contract and completion bonuses. Unfortunately the commuting contract I wanted wasn't interested , they like young young guys with type ratings . Commuting would have been my first pick.
Its like you Bondi moving to Europe, many carriers , many options, many opinions. At the end of the day each of us has to do what is best for ourselves