How good is suse 10.0 OSS
Very good, as are most distros.
Is it better then Mandriva 2006
For some, yes, for others, no. Distros all contain the same core software, the Linux kernel and the standard OSS apps. What differentiates them are mainly the configuration and administration tools. There is no one "better" distro for all, if there were all the others could give up and go home.
There is only one person who can really tell you which is best for you, and that person is you. Try two or three distros, pick the one you like best and stick with it
for a while to fully learn how to use it.
"Insanity: doing the same thing over and over again and expecting different results." (Albert Einstein)