There is a privacy conscious cryptocoin that is gaining quite a bit of attention lately. It is a coin called Particl and it has a well known backer in Charlie Shrem.
https://www.coinbureau.com/analysis/particl-part-new-privacy/ The coin has rallied quite a bit recently and could be a good investment for returns in 2018. Unlike other privacy conscious crypto coins, Particl does not have its own blockchain but is a dApp.
Particl is also a Proof of Stake (POS) coin which means that you can earn funds merely from holding your tokens. This is in contrast to Monero for example which is PoW.
Would you invest in Particl? The market cap is still quite small which means it has a great deal of upside if the use case is there.
If that was backed by charlie shrem doesn't mean if that will become a promising coin in the future. We have monero that very well known about the best privacy coin that runs on its blockchain and remember it can't be traced and we don't need more privacy coin if that will be still pegged to the centralized exchange site.