In the consumer space IBM sells a lot more Intel based systems then they build PPC chips for Apple. Saying IBM vs Intel in terms of looking at the processor market is all screwed up because IBM is best known to the world for selling Intel based systems, it took the Mac community many years to drop the 'IBM-clone' tag and start using PC to refer to x86 based systems, turning that around on its head particularly with what IBM sells to this day just wouldn't sound right.
Motorola makes very low end chips, they are more comparable to Cyrix then they are to any of the other three in terms of performance although given their main application, embedded devices, they are providing what the customer wants(versus Cyrix which could never manage to make a competitive processor for their market). And the final issue, IBM's best chips kill anything Apple is will to provide their customers with. They want their profit margins to remain extreme, and they will not step up to the price of the full Power4 series line(not the cut down varriant). IBM's top tier chips are not available in any consumer platform nor do they have a part that was designed from the ground up to fill that market, they just Intel and AMD chips(and will soon be helping AMD fab their chips also). IBM also used to make a Cyrix based solution several years ago to add a bit more.
Due to these factors, you have one company who is best known for selling their 'competitors' parts who also happens to make several types of their own chips of which one of the low end varriants is used for a 'competitor' of theirs who also happens to be a 'competitor' to their 'competitor'.......
Now isn't it just a lot easier to say PC v Mac
