I do rack pulls instead of deads from the floor because because it feels a little more comfortable to me and I can maintain form with less difficulty; in other words, it seems less likely that I'll get injured. Plus, the movements we do in our events don't really require going down as far as deads from the floor require.

When I set the racks, the bar will be slightly above mid-shin level, so I get a good pull. I started doing rack pulls fairly recently-about six months ago-and the main reason was to strengthen my lower back to improve my squats and to train the back movement necessary for wob and caber.

I would say try both and see which you prefer; I don't think you need to do both-go with one or the other.