duh vs doh

any considerable difference?

No, they're equally puerile.

I'm still sad you haven't picked a specific name to stick with

doh is an exclamation that someone makes when they make a mistake - Think of Homer Simpson.

Duh is more sarcastic and is a way of saying that something is obvious. Either the answer you have just given to a question or something someone else has said.

thnx dawg