google:- difference between solaris and opensolaris brings up numerous pages worth checking out and shed some light on your question.
Just as a bit of advice prior to downloading the operating system you might find it advisiable to run the Sun Device Detection Tool to see if all your hardware is supported rather than downloading the o/s trying to install it, and finding that a piece of hardware won't work. You'll find the tool at the following address:- http://www.sun.com/bigadmin/hcl/hcts/device_detect.jsp There's numerous amounts of documentation availiable to you just google or use the search tool of your choice as far as your question which to install perhaps I'm not the one to ask as I'm running OpenSolaris on my Desktop & Laptop and although I've downloaded Solaris 10 I haven't been able to find time to install it. My guess is that coming from Windows that OpenSolaris would probably ease you into unix. Hope you enjoy. -- This message posted from opensolaris.org