32bit or 64bit

I’m upgrading to a VPS and it is asking me if I want a 32bit or 64bit operating system.

What is the difference, and is CS-Cart limited to one or the other?

Thanks for your help!

Go for 64 bit. CS doesn’t care for anything other than php and sql

Okay. I’m also using Worpress and phpBB forum software. Does that limit me to a 32-bit?