EPPM 8.3 or EPPM 8.2 about java JDK with 32 or 64 bits, which one I must set???

EPPM 8.3 or EPPM 8.2 about java JDK with 32 or 64 bits, which one I must set (64 bits OS servers)???

I always have been working using jdk 32bits or i586 version and try to let out the 64 bits version. What's the the advantage or disadvantage of using a 64 bits version with

a EPPM environment with 8R2 or 8R3????

And the same with PPM version.

Thanks,