MFS vs TMPFS

[Marcin Jessa <lists%yazzy.org@localhost>]

Hi Guys.

What would be the advantages of using tmpfs over mfs as memory file
system? 
Say I want to mount my /tmp as tmpfs instead of mfs, would that be a
good thing to do?
Or I would like to rather mount a file systems on a LiveCD or my
embedded device as tmpfs instead of mfs, would that also have any impact
on the system ?

Cheers
Marcin.