Originally Posted by lemon09
i think rhel(red hat enterprise linux)
RHEL is a paid version, as in "no pay, no updates". If you want to use a Red Hat alike system that's not that restrictive you should probably choose either Fedora or CentOS.
or any debian based linux(like slackware) would be a good choice...
I am no genealogist, but as far as I remember and for the technical details I know about one and the other, the Debian and Slackware genetic lines hasn't ever crossed with each other. They have always been independent distros. Besides that even if that's not true, they share nothing in common nowadays, besides a linux kernel of course.
Looking in distrowatch.com, and checking the scientific square on the search page, I get two results only:
I know nothing about these.
Searching for "linux scientific" in google you might get some results.
However, I don't think that any distro is better than other for the OP's purpose. You can virtually use whatever linux based software in whatever distro you choose. So, if you want Ubuntu, go for it.