shuuhen

Um... I'm a little confused about what you want from the thread. The title "Why Unix?" is fairly vague.

For the other question: Pick a version of Linux/*BSD/Solaris/Mac OS X/other Unix-like. All of the operating systems I listed are Unix-likes. They all have advantages. If you're interested in using Unix-like operating systems to enhance your resume, I recommend using one(s) that require using the command line.

Graphical administration is great to some people, but the more comfortable you are with the command line for Unix-like operating systems, the more comfortable you should be moving to a Unix-like platform you haven't used before.

Recommended Linux distros:
- Gentoo
- Arch
- Debian (NOT a derivative of it)
- CentOS
- Slackware
~ Linux From Scratch (LFS) - start using one of the above distros first if you're interested in this one. Gentoo would probably be an especially good one to pair with LFS.

Recommended *BSD's
- FreeBSD (could consider the Gentoo FreeBSD setup - see Gentoo site for details)
- OpenBSD
- Other BSD's are probably great too, but I haven't used them or had serious discussion of their advantages with anyone.

Solaris - I think technically this one's a System V Release 4 descendant. Probably both Solaris and the various OpenSolaris distributions would be good. I haven't had time to use them yet, but from various discussions with network engineers/system admins/etc it is commonly run on servers. Also ZFS is supposed to be an amazing file system.