if you watched shippuden first you'd be pretty lost considering you're jumping in halfway through a series.

you wouldn't know any of the characters, the plot, and side stories, or techniques. Shippuden isn't a 'new' series like so many ppl consider it. Its the same old naruto. Atleast DBZ had its own plot from ep 1. You didnt have to know anything from DB to watch DBZ, You can't do that with naruto.