I have not used Whonix, as it’s too complicated for me, but I have used tails. I used to use it a lot before I found Linux Kodachi, which is now my main ticket into the Darknet. I still sometimes use Tails when I want a quickie foray. Tails comes ‘as is’, so you don’t have to really do anything, while Kodachi needs some set-up, and a bit more complicated (but nowhere near like Whonix, Qubes, and others are). Here’s a comparision:
Tails will do everything for you, even auto-connect. Combining Linux Mint and Whonix is going to get really complex, really fast. If you’re like a beginner, I would not recommend it. I’d consider it more for intermediate to advanced users, like Kali Linux or Parrot OS.