NUFC

I bought a capo for my Ovation acoustic over the holidays. I find that if I put the capo on the first fret, the action over the entire fretboard is much lower overall and a lot easier to play - no buzz, no noticeable loss of sustain. With the capo off, the guitar is much more difficult to play. My question is this: Should I get the string height adjusted at the nut or at the bridge? NUFC