Im surprised this hasn't been said yet: I would not choose a house in which the children would be given significantly unequal bedrooms.
As for older younger, i can only speak for the older children: We've had the best in some ways -- we didn't have to compete with older siblings for our parents' attention as infants and toddlers. But we have the worst in other ways: We were always held responsible for what the younger ones did -- he's too little to know better! Why didn't you stop him? We were unpaid, unwilling babysitters. I did many more chores than my younger siblings, simply because i was old enough to do them well. By the time we older kids were out of the house, the amount of work was greatly reduced. We orders had to fight for every privilege, then we saw the younger children given those same options at younger ages. In my generation, the oldest didn't automatically get everything new -- many of my clothes were hand-me-downs from cousins. The youngers, though, got hand-me-downs AND some new clothes; they always had a greater quantity than i did. First choice on small things here and there's doesn't sound like all that much in exchange.
Who has it better? Doesn't matter, given that none of us can change or choose where we end up.