A systematic comparison of accelerator physics issues from the beam‐beam interaction to single particle stability including ring and IR layout, synchrotron radiation and lost particle backgrounds, and single and multi‐bunch instabilities is given. While some practical handicap probably accrues to the asymmetric design because of its extra constraints, the differences in the two approaches tend to be obscured by larger issues such as how to achieve the enormous increases in luminosity demanded of a b‐factory.