Well, it all comes down to tastes and preferences, but Linux Mint is made to be a very easy transition for (ex-)Windows users. It works out of the box, looks intuitive and has great support on their forums. Give it a try and if you feel like you want to try out other distros later, it all gets easier once you are familiar with Linux overall.

And yes, what you mean is dual booting and Mint asks you on install if you want to choose that option and sets everything up for you.