Hello OP,
I'd rather take one long flight than two shorter flights.
In October I flew DL ATL--TLV, it was a 14 hour flight. There was time to eat, sleep and be merry.
And about two weeks ago, I flew AA DFW-SCL (Santiago, Chile), nine hour flight departing at 11:30 pm. There's two hours of food service, then 1 1/2 hours before landing, we're up for breakfast and that leaves 5 1/2 hours to try to sleep. I had 5 1/2 hours to wind down, sleep and be woken up.
So, give me a longer flight any time.
And that's my two cents.
David