The easiest way to check if a Disk uses GPT or MBR Partition would be to do it from the Disk Management window. If you are familiar with the Windows Command-line interpreter, you can use either ...

BIOS mismatch causes the "Windows can't be installed to this disk" error. MBR for Legacy BIOS, GPT for UEFI. Convert disk partition style to match BIOS type. Wipe ...

You'll see an option to select one or the other when you're partitioning a hard drive or using a disk partitioning tool. Another way GPT outperforms MBR is how easy it is to recover from corruption.