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With that little info. I'd go for the '03. Might wanna post a little more info. Same cab style ? Is the '04 a 4x4? What do you need it for? engines? etc.
They'd gotten the bugs pretty well worked out by '03, then introduced some new one's for '04...
Need to see a Carfax, an OASIS, look at and drive both trucks before I could express an opinion. The more I knew about the history of either truck, the better informed I would feel in making a decision.