Simpson races with guts every time. Sometimes she comes out on top, sometimes not. Who cares how she dresses. Rowbury is fine I guess, but it's so painfully obvious how safe she plays it in races, tucking in behind Simpson and outkicking her if she can. Remember at USAs 2 years ago when she sat on Huddle in the 5000 and still got outkicked? Also I'm pretty sure she only has 1 WC medal instead of 2.
Simpson is not a one-trick pony. Though, like Shannon, she mainly runs the 1500 (as that IS her event, are you mad that Coburn mainly runs steeples on the DL circuit?) she has a USA 5000 title to her name (same year she scored 1500 WC silver), she's crushed Rowbury in several DL 3000s, and, lest you forget, owned the steeple AR before her own training partner took it. The only counterpoint is that Rowbury usually does a full indoor season, which Simpson has not done recently, although she does own multiple US indoor titles from earlier years.