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Linux is a distinct operating system with similarities to Unix Operating Systems. It is ran on a lot of servers and supercomputers so it not only for personal computers. Linux has many similarities to Unix OSs but it is a different OS. The experience for users of a traditional Unix OS and Linux should be similar. I agree with your statements regarding flexibility, learning curve, and software compatibility.
Linux is a personal computer subset of Unix, which is one of the original large computer OS. I don't know Linux, but I do know several versions of Unix and I will say...yes, much more flexable, but you will need to actually learn how to use it and some software will not run with it.
Once you understand Linux, you will like it a lot better than Windows, but it WILL take effort on your part to learn how to use it.
I use AVG (always have). It catches most everything, and updates daily (or actually, min daily, otherwise, every time you turn your computer on.