It depends upon whether it is a PMUA or PMCO. PMUA are narrower and very uncomfortable, nothing more than economy seat that lies flat. PMUA 767 seats are 2-2-2 in BF whereas PMCO are 2-1-2. PMUA in 777 are 2-4-2 whereas PMCO are 2-2-2, obviously more space. Further PMUA BF seating has zero storage at the seat, everything must go in the overhead whereas PMCO has shelves and a nook behind the seat.
Actually PMCO 777have little room in the footwell. I find the PMCO seats extremely uncomfortable and hard as a rock! Also,the service is much worse on PMCO flights in general. The PMCO BF might have been nice in the 90s, but now the seats are outdated! It is surprising they have the same design now on the 787 as they do on an outdated 777. The 757 is uncomfortable for the price they charge especially in a window seat. If I had to fly BF on PMcO I would go for the 767, although the service is mediocre to poor.