Harp or Violin?

We've been thinking about hiring live music for the ceremony. We're torn between a harpist and a violinist. I've always wanted a harp at my wedding but now that I'm listening and watching videos I'm worried the sound might not be full enough to fill the room. I absolutely love the sound of the harp, it's so beautiful but it may be too one dimensional for this situation? I would really love to have a harp and a violin but unfortunately that's not in the budget. Any one have experience with either a harp or violin?