The easiest answer is "If you have to ask, then you would be better off not using it."
But really, where are you proposing to use Solaris? If it's on an enterprise server, then yes; you may well be better off using Solaris. However, if it's an enterprise server, then you'll probably do some research yourself online or hire a consultant who will be able to recognise your needs and you won't need to rely on the word of a stranger sitting 10,000 kilometers away from you.
If, as I suspect, you want a desktop operating system, then you will be better off with Linux. Look at the post in this forum about ZFS, and you'll see the reasons that I have mentioned.
Don't get me wrong, there are OpenSolaris Live CDs which are kinda fun to play around with; but they are definately not for newbies at this stage.
I have not tried Solarios yet, but ppl have told me it is really cool and impressive. Can you tell me why I would want to use this OS compared to other Linux and Windows OS?