My granddaughter with Santa

[fdexclpl]

I've had good luck with the diffuser. Sometimes there isn't a ceiling or a wall to bounce off of.

[Peekayoh]

On flash diffuser, bounce it, fire through an Umbrella ... it doesn't really matter, they're all methods of diffusing the light.
I would suggest, however, that an on-flash solution requires the flash to be off camera, for portrait work anyway.

[DWessel]

Flash diffuser is usually best. Bounce flash, while taking away the harshness, can create a Racoon look with shade spots in the eye sockets.

[Peekayoh]

No single answer. Whatever works for the particular shot.

[Rooz]

Flash diffuser is usually best.

this is only true if its a decent diffusr. ie: soft box, brella. the standard little clip on ones are pretty useless.

[dr4gon]

this is only true if its a decent diffusr. ie: soft box, brella. the standard little clip on ones are pretty useless.

Do you mean the wide angle diffuser? (or a tupperware?)