"The best" is purely opinion, so I won't say mine is "the best", just my opinion: I prefer Linux Mint KDE edition.
People that say Linux is hard to learn almost certainly haven't used it. Or didn't give it much of a shot. As you've found, it's not all that hard. My ~60 year old parents use it, my 5 and 8 year old kids use it. I have a couple of friends that are now using it and they have no real problems. I think if you go into it with no preconceived notions then you'll be fine.
What I suggest you do is install virtualbox on your current machine, then install it in a virtual machine to try it out. Or you could download something like Linux Mint or Ubuntu, but it to a disk and run it live. This will allow you to try it out before installing it. It's not quite as fast as running it for real, or in a VM but it will let you quickly test it.