Hi bfot123,
Actually from a software perspective there is no differene. The 32 / 64 bit
refer to your server hardware. If you run a 64 bit server you require the
corresponding 64 software ( in our case Project Server). Generally
performance is much higher in an 64 bit environment, but I believe that the
hardware is also more expensive.
So make sure you know your hardware before you puchase your software.
Hope this helps