Darwin Bootloader EFI v8 to PC_EFI v8

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I have a stable AMD machine using Zephyroth's Leopard 10.5.2 rev2 (now updated to 10.5.5).

I am using the standard Darwin bootloader (non-EFI), but I am curious if there's a difference between this and the PC_EFI v8.

This is simply a question to satisfy my curious mind on the difference between the two and possible advantages and disadvantages both has on a machine.

Also, I'm using MBR partition. I know PC_EFI v8 cannot be installed on MBR, yet I read on another forum that it now can.