I promised myself I would not comment on these negative comments (below) but man, this is a bit extreme.
Anyways, I believe in both of these projects.  I believe they have great potential.
The best thing about it is that it's cheap enough for  you to invest without risking too much if it hits the moon.
I don't personally expect to many any substantial profit in 2018 but it's definitely a long term hold for me (while keeping up with the updates of course). 
I found out about these projects a little later than most people on here but I still felt comfortable enough to invest even after the prices jumped up already.

I honestly think it'll be XRP but I'll throw some other ones out there:
-OMG
-WAVES
-IOTA
-MONERO

Depending on how much you're willing to invest, you should really mix up your alt coin investment strategy.
If I were you and I planned on buying alts to hold for the next 2 - 3 years, I'd invest in some really cheap alts ($0.01 - $0.20) as well as the more expensive alts like ETH, LTC, XMR, ZEC, DASH and also some mid range alts like XRP, OMG, WAVES, IOTA,.

The best thing to do is research all the projects people have suggested and go with what you feel is going to be your best investment but i don't think you should invest all into penny alts or invest all into really high priced projects. 

Good luck!

I hope XRP overtakes BTC but I think for it to happen in 2018 is a bit far fetched IMHO.
But then again, Adidas passed Nike and all it took was Kayne!