Which is more rugged, ibook or powerbook?

I've got the chance to pick my next laptop for work and I'd love to have a Mac this time around. Speed isn't a constraining requirement but durablity is. Which is more capable of withstanding fairly rugged and continuous abuse?

My two choices are the 1.2GHz 14" ibook or the 1.5GHz 15" powerbook. Suggestions?

Kingsnapped said:

iBooks are more rugged, but the powerbook can take some abuse. What kind of durability are you looking for?

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Well, my wife has the original 17" pb that I've used some for work, but the case has warped twice on us.

Mostly I'm looking for a system that I can 'toss' in the back of the truck, and bad things won't happen to it with just a sleeve for protection. I spend a significant amount of my time driving between job sites, and working in the not-so-clean areas of constuction sites, so it needs to take clay well