Congrats,
If it doesn't rain it pours. You find yourself in a very envious position,to be able to have a choice between two operators. You only, can make the desicion so it requires plenty of thought.
I have a friend who use to fly for RBA on the B757, and used it as a stepping stone to move on to bigger and better things. He said he was over worked and under paid, and didn't really like living in Brunei?
Best of luck with you choice