Try both, and others! If you don't want to, or don't want to all at the same time, then don't. That's fine, too. They're all free (of cost), and most have polished products certainly worth a try. I've no experience with Arch myself, and am aware of it's reputation, but I say if it interests you and you aren't daunted by the reputation, then give it a spin. Same for mint. Why not?
As for the upcoming Mint 18, keep in mind that you don't have to upgrade right away, or at all if you aren't ready. I'm excited about Mint 18 and can't wait for it to drop, but I won't be upgrading to it right away. I'll test it out, sure, but it won't replace my main OS until it matures for 3-4 months first, barring any big problems of course. I am usually not an early adopter.