I was referring more to how nice and thin the Pro is. I never saw a regular Macbook up close, but they look thicker which makes it seem more sturdy.
Having handled them both, I would say the aluminium macbook pro is sturdier, although I think the plastic macbook is heavier, but I have a sneaky feeling the plastic would break upon impact. I quite liked the white macbook too, shame they never updated it with a newer processor before the discontinuation.