Well in my OPINION most worth coins to sink your money in is:
And maybe Stellar because it has a lot of swings.
For IOTA it has a really strange concept behind it. The technology they are using is a little bit different from other cryptos. It might skyrocket or be dumped. One wrong move and they are out of the game.
For the other curencies, I have mentioned before they have a potential to 2x - 3x by the next year.
**EDIT**: don't take my words for granted. I'm not nearly a crypto expert.