Unibody! yes it is, the unibody is beautiful man, lighter, not that sensitive when it comes to wear and tear as the white, and its thinner, plus the battery of the white is with the body of the whole mac, but the unibody has a case and the battery is inside, which i love because when im at home i just take out the battery and plug it in while using it.
Well, some questions only you can answer: - Is FireWire a big deal for you? The Unibody doesn't have one while the White does. - What do you prefer in terms of casing? The "classic" white or the "latest" unibody? - Is the Unibody's newer trackpad (glass, no button, multi-gesture features) a big deal for you? For other factors, go to the thread bacchus_3 pointed out.
It's not a good idea to take out the battery since the CPU will throttle down to a single core only. More here: http://www.gearlog.com/2008/11/apple_notebooks_take_huge_perf.php