Transition, did both. I was a happy SH bloke, but forced into LH after dispute. They can keep it. But spent many years listening to why some preferred one to the other.( I must have a sympathetic face) And it would appear to me, that more often than not, is was family reasons or personal circumstances that made the decision. More so than money. The SH blokes complained about being bored witless, the LH blokes complained about being buggered. In other words, it was a normal conversation, you get on any flight deck, at any given time.