In reply to Heike: ok, take this as the spew banter that it is, given I have not done either route. However I've dwelled on those routes, so basically: do the Philip Flamm if you want the full experience, conditions are good and if you are up to the task; do the Aste-Susati if the PF seems too much for whatever reason. Aste apparently gets dry quickly after rain, where as chimneys up high in the PF become a probelem if wet.
A climber named "Albi" (user name) posted photos from each route on Summitpost. He said PF was way harder, and you need to be fast with a long day. To me the PF is more prestigous.