32-bit with bigmem or 64-bit debian, which is better?

[Umarzuki Mochlis <umarzuki@gmail.com>]

My hardware is Presario CQ40-115AU
It have AMD Turion X2 processor, 4 GiB RAM (2 X 2 GiB)

Since 32 bit Debian have more packages I'm thinking of going back to 32-bit with bigmem kernel. The questions are:

Does running 64-bit debian will boost the performance compared to 32-bit on my machine?

Will it hinder (using bigmem kernel) my work which mostly related to virtualization using virtualbox?

Any other pros and cons?

-- 
Regards,

Umarzuki Mochlis
http://gameornot.net