I sadly cannot give any real answer there, as i have never tried Suse9.0... I have however heard that it is supposed to be very easy to use...
1) Which has better JavaVM support? Is it out of the box support?
You have to download it from java.sun.com on downloadable version of mandrake atleast.. But that is really no problem, as sun java comes with a pretty nice installer :-)
*Am i to understand that the Suse live eval cd is just that, a demo? But the FTP install is complete?
The Suse live cd is a bootable linux distro, that is used to see how suse works.. I believe it is fully useable, but not easily installable... FTP install is full install afiak.. You can also buy the dvd/cd sets.
*The Mandrake 9.2 ISO is complete? Including 3d gfx support?
The free downloadable mandrake cds are full version yes, but does not come with commerical software. It does however come with plenty of open source programs, including open office, bunch of browsers, irc clients, games, celestia"amazing space 3d simulator", web server and so on... 3D support is easily fixed by downloading linux drivers from nvidia or ati.. There is really no problem installing these, as long as you read the readme :-)