The Aluminium is not portable: too delicate, while the iBook is rugged and sturdy. Last week I travelled in Slovakia for a couple of presentations and the iBook was at home in the Jansport back pack, stuffed with other things (ordinary backpack, not a laptop one). The case is scratched, but you do not notice it: I cannot think of what had happened to the Aluminium (I have seen so many Titanium cases simply destroyed after a couple of trips).
I think that it depends on how you travel and how often. I have traveled with my AlBook now for two years (I make 3 or 4 flights per year) and I have never had an issue with it. Granted, It's not in a backpack, but in a standard laptop bag. It has a couple of scratches on the case, but it's handled the trips just fine. The plastic case will handle abuse a bit better than the aluminum one tho.
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