I can't even begin to imagine why anyone cares that "I don't even think they have personal TVs behind headrests."
As Essex Wanderer says: take a book or a kindle. Better yet: turn your light off, stop interfering with other people's attempts to get some sleep and fortify yourself for an eight-hour time change and an overnight flight.
In economy, there's no meaningful difference between volume carriers. A ten hour overnight flight in an overcrowded cigar tube is going to be ghastly whoever you're flying with (though UK- and NZ- registered airlines are typically more liberal with the booze than the puritanical Americans, so you're less likely to notice) .
Just grin and bear it - and dump the silly preoccupation with brands you've managed to pick up. Or fork out the £5k for a Business flight