NES - I would think they both have their slight advantages. Toss up

PS1 - BB gains more levels to go up on easy mode, and on all modes thief loses his running superiority. BB wins.

DoS - Thief gets 1-2 extra hits added on to him.. BB gets his hitrate, damage, and everything scattered across 99 levels, and also reduced a bit. BB becomes a weakling... Thief becomes insanely powerful.. Thief wins


NES - toss up
PS1 - BB
DoS - Thief by far....