Thanks for your help
Actually, I have some budget constraints... with a strong effort I can arrive to the PB but, of course, if the iBook can do what I need It is better for me to buy something 6/700 euros cheeper.
Anyway, I do plan to use the laptop WITHOUT an external monitor and, although the 12" and 14" iBook have the same res, I thought that in the 14" I can use a smaller font for code (the real need I have is viewing a lot of code per screen) I can fit in it more lines (because of its bigger size).
Regarding OpenGL, yes here the PB is far superior.
What about future compatibility with Tiger? The video card should not be supported: is it a big problem?