I'm a 777 driver, rather than Airbus.
Keep in mind you will be frozen on your first type for up to five years (at least four anyway). If you particularly want longhaul, it will be worth waiting until you have the hours. Alternatively, if you want to join ASAP and don't care where you go, join now but keep in mind you'll be stuck on the Airbus for the duration of your freeze and will only get off it subject to vacancies elsewhere.
I'll let others comment on typical Airbus rosters.