[CentOS] Please help me rate vnc, rdesktop, and freenx

I have been dragging my feet on remote display, and have just gotten VNC 
going to have SOMETHING to move off the start line.  But I need the 
'best' for different situations, so I want to rate them.

1 to 3 where 1 is the 'best' for the catagory and 3 the loser.

                            VNC      RDESKTOP      FREENX


Server memory
Server cpu
client memory
client cpu
bandwidth

thanks.  I AM search the net for this information.  So far have not 
found the magic query request :)