Well. I was in exactly same position some time ago.
AluBook:
- LED backlit screen. Better contrast, brightness levels, thinner.
Unfortunately if the Aluminum back plate gets dented and you have to replace it, the screen goes too, since its glued to the back plate. THAT will make it expensive!
- DDR3 RAM. This will show up in regular tasks and games as graphics depends on system RAM. However, since the RAM is 2GB in both which is not really adequate in today's terms, you might not see much benefit.
- 160 GB HDD. The Aluminum one has more disk space, the white one is at 120GB but on that level, I doubt it would be a problem. Not for me atleast.
- Battery Life. Apple says you get better life out of the newer MacBooks. But its under their 'ideal' conditions.. I think its not much different.
- Multi-Touch trackpad. Large, supports many swipe gestures and stuff like that. Zoom in/out like iPhone.
If you have it, you will feel limited without it. If you dont have it, you wouldnt care. Though it does ease out stuff, its just about training yourself to get used to something or the other.
- UniBody Enclosure. This makes the AluBook sturdy. But its thin. A thin aluminum plate is very prone to dents. And it is much less resistant to impacts.
Though it does not crack as opposed to some WhiteBook cases we've read about. Nevertheless, the WhiteBook should be able to take much serious impacts than the AluBook.
- Firewire. If you need firewire, you have no option but get the White MacBook, or MacBook Pros. And you dont have an extra USB port to sompensate!
- Mini-Displayport. This thing eases out connectivity to Apple's LED display and stuff. It has become popular with current generation Macs and is good to have as an option. But I wouldnt take its absence on WhiteBook to be a dealbreaker. You get adapters anyways.
- Thinner and lighter. 0.5 pounds lighter and a tiny bit thinner. Doesnt make a difference to me.
WhiteBook
- Cheaper
- Can take more impacts, plastic.
- Has Firewire
- Updated to all the UniBody hardware other than DDR3 RAM.
- Has a better battery life under certain conditionsm, say low brightness and the fact that its battery is a higher capacity than that in UniBody.
Sums it all up I guess?