> the processors that make up what Apple called the G4 series vary bit in performance
> per MHz, then there are the differences in cache memory. For example, a 7455 with
> an L3 cache performs as well as a faster 7447 without an L3 cache. So its not that
> straight forward. But the PowerBook would probably have a slight edge

Yes, without doubt, as his PowerBook and iBook have the same generation and type of G4 without L3 cache, with the G4 in his PowerBook being clocked higher.

Btw, there are also other opinions regarding the PowerBook G4 vs. iBook G4 decision:

http://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=8503&start=29