Well, since this is specifically an Ubuntu-related site, we're probably going to toot our own horn and suggest that you try a few of the official Ubuntu flavors.
When you boot the Ubuntu installer, you will have the option to "Try Ubuntu" without installing. Do so.
Test your hardware. Test the look and feel. Take your time. Use it all day. Stream a movie. Do some work. Look for any rough edges.
Then try another.
NO Linux distro is a drop-in replacement for Windows. That means that they may be fully-capable operating systems, but behave differently from Windows. They cannot be made to behave like Windows -- you must adapt and learn (like we did).
Your Windows software won't work without extra add-ons, and some Windows software simply won't work at all.