The Average A320 Roster will be 60-65hr IP with 10-12 Days off while the Average SO Roster would be 70-80hrs with 12-14 Days off.
Generally speaking, on the Bus you'll do less IP for more days worked due to the high volume of Domestic flying... then out of the blue you'll get smacked with an outlier roster and push 85 hrs while everyone else is doing 60.
Bidding plays a massive part in your lifestyle. On the Bus, if you wanted, you could avoid overnights and bid entirely on early starts that finish by 3pm and see your kids after School. Or you could chase overnights and avoid early starts.
Long Haul is much the same. Do you want to chase Long trips with clear days off overseas? Or prefer shorter out and backs with more time at home? So long as your bids fit the window, you can achieve either.
If you assume the first 8-10 years at Air NZ will be as an SO/F20 I'd advise giving both a go.