Most people will tell you to buy the 12" Powerbook, but it comes down to what you want. I bought a 14" iBook even though I could have bought a 12" Powerbook because the screen is bigger and more comfortable for me to look at (even though the resolution is the same). Portability is not a problem even though it's 14". If you plan on using an external display, you might want a Powerbook. But if you are interested in just using the laptop itself for everyday purposes, I'll say the iBook does a fantastic job at that.