Left or Right?
They are going to evaluate you based on the hours that you have and of course the position that you are applying to.
Thus, if you're going for a FO position, take the seat that you think you will perform the best in. I don't really think they will bother too much if you are sitting on either the right or left as in the briefing they do mention that you will handle the flight as the Commander ie: decisions, briefings, checklist call etc will all be at your direction.