Streaming boards further down the line don't tend to take too much notice of preferences until you get to the role disposal stage, and even then it is still only a preference. As has been said it is bums on seats that is the over-riding factor and nothing you do or say is likely to change this. As for preferences at initial interview, anything other than FJ is likely to lead to some fairly probing questions, in which case you had better have a cast iron reason for that particular preference. Notwithstanding the fact that RW pilots are generally better looking, more co-ordinated with a more highly developed sense of humour than their FJ and ME counterparts, it is probably best to say that your first preference is for FJ.