32bit or 64bit Android SDK on Windows 64bit OS?

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http://stackoverflow.com – Installing a dev machine for Android development. 64bit Win7, soon will upgrade to Win8, 16GB RAM. Now the selection at the android download: 64bit or 32bit Android SDK? What should Duffman do? Seems most poeple here go for the 64bit version, but are there arguments for/against? Hasslefree installation? (HowTos)