Thank you for the info about the memory ceiling, I did not know the "12 books had a lower memory limit then the "15, that actually effects my opinion.
They technically do, but the difference is only 768MB when comparing the last revision. The 12" has a max of 1.25GB and the 15" has a max of 2GB. Plus, if that 1 slot goes bad on the 15", you would be stuck with only 1GB anyway.
I wouldn't compare the Macbook with the Powerbook as they are different platforms and the intel's will be faster hands down.
In my opinion, they are about the same speed depending on the OS. Both on Tiger, the PPC would probably win. Leopard bogs down all the machines I have seen it run on, PPC and Intel, but I think the Intel would
just barely outperform the PPC. Of course, Snow Leopard is Intel only. It varies.
