Should I start snowleopard in 32 or 64 bit?

I have just downloaded a "32- or 64-bit Kernel Startup Mode Selector" piece of software - but I have no idea which mode to startup in, so I haven't used it. Which is advisable or doesn't it matter?

MacBooks (not to be confused with MacBook Pro) cannot, to the best of my knowledge, boot the 64-bit kernel. But for most people booting to the 64-bit kernel would be of little or no benefit. A good summary of the situation can be found here:
http://www.macfixit.com/article.php?story=20090826074252596
Regards.

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