flash files are generally smaller than director files.. director was developed for multimedia CD's, flash was developed for the web and hence is better for web use. besides the "more powerful" features of director would probably be the same ones people would call a useless waste of time
- 'cept for the newish shockwave 3d engine which has it's place in games and product show cases.. flash is the standard for web based multimedia no point in using something else unless you've got a very specific need for it.. (a 3d game for instance)