Bootable USB disk for Ubuntu from Mac; which partition type (APM/MBR/GPT) to choose?

Question

I want to make a bootable USB disk for installing Ubuntu from Mac. When I format the USB disk from terminal, i use

$ diskutil eraseDisk HFS+ KINGSTON GPTFormat /dev/disk1

But there are other available options for the partition, like APMFormat and MBRformat. So which should work for Ubuntu?

I did some search, here's a link that discusses these three formats. Here's a quote:

But if you want to boot OS X (intel) from it, then you need GPT

If you want to boot OS X (PPC) from it, then you need APT

If you want to boot Linux, Windows, BSD, or other OS that boots from the BIOS then you need MBR.

I'm a little confused here; any suggestions would be helpful!