It's mostly a clean installation. You can copy the contents of your home directory, which is where personal configuration files are stored, in the hopes that some stuff will transfer, but surely that won't be complete.

You could also try dual booting, installing two OSes and you'd choose which to run at start up. You can configure these so that files on one are accessible from the other. This is pretty easy to do if you're even slightly tech savvy.

I've found that the shiney new features are usually buggy. If you're into helping improve things, using and fixing the new stuff is a great way to contribute. If you're reasonably tech savvy, you're going to be able to figure out any distribution. With few exceptions, they're all easy enough to use. I even doubt the portrayal of Arch in this comic. If you're not into developing stuff or just want to get your feet wet before diving in more, starting with Mint is easy. And it's also easy enough to switch or expand if you decide to try something different later. There's not a lot of lock in with Linux stuff.