The best question here would be for a primary or secondary OS? Due to the software and game being saturated with 32bit applications and games you may want to consider staying 32bit if you are a regular gamer to avoid certain incompatibilty problems. On the other hand the difference and stabilty may prove better with a 64bit version just like 32bit prevailed over the old 16bit formulas seen with Windows 3.0, 3.1, 3.11, and 95 prior to the OSR2 release.
While the 64bit version has a degree of 32bit compatibility like XP has with older 16bit programs it's like comparing XP to Linux at this time in some ways. It will still take several years before 64bit will ever become the actual standard with a volume of games and apps available.
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