The advantage of Grub is that it doesn't depend on any one of your distros. It will start anything, running as "native". It can be edited from anything that can access the partition it sits on. If that fails, it can be run from a floppy.
When one of my Linux HDs died, it was (of course) the one with the boot stuff and Grub on it. I dug out the Grub floppy and was up and running with the other two HDs in a minute or so.