I have used 386 and amd64 versions of both Ubuntu and Debian. I have noticed a difference in compile times, but everything else is the same. I switched back to 386 version because there is no amd64 version of macromedia flash, w32codecs, and openoffice. Using a 386 chroot environment is an option, but causes problems. My personal opinion is to stick with i386 until a larger fraction of the rest of the world switches to 64 bit computing.
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