Should I install 32 or 64 bit?

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http://unix.stackexchange.com – I'm going to be installing linux on my 64bit netbook. Last time I checked I was advised that for personal computers (not servers) it is best to install the 32bit version. I believe the reasoning was that some software isn't compatible with the 64bit version. That was more than a year ago. Which version should I install and why? (HowTos)