Jennelle Crothers at techbunny.com comments on file systems:
The next important decision is whether to install Windows Server 2012 on the GPT disk or use DISKPART to reconfigure it back to MBR. (The DISKPART commands to convert from GPT to MBR and vice-versa are readily available using your search engine of choice.) GPT supports larger disk sizes, but the solid-state disk in this machine isn’t that large, so I could go either way. However, you need to know which you are doing because it determines how you set up your bootable USB and your BIOS.
Read more at: GPT, UEFI, MBR, oh my!