The biggest difference to my eye is the eyebox. The Leupold is generous, the Burris is standard. The light gathering differences are not so great that I’ve noticed but I’ve not done side by side comparison at dusk. Both have adjusted to and held zero on squirrel guns and ARs. The Burris B-plex with three dots is not as intrusive as I thought, much better than the Nikon BDC.
