64-bit as of now faces problems like flash not supported(but u can try gnash-free player),win32codecs not running .although may be some workarounds available(chroot?) .as for now for a desktop user if he got a 64-bit capable hardware go for 32-bit one.it supports multimedia better.but its upon u.
Some distros do support having both 32-bit and 64-bit libraries together, there you can easily use flash player and such softwares which don't work on 64-bit.
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