I think privacy coins will be big in the next couple years. With the U.S. Government changing the tax laws and other countries around the world trying to crack down on crypto, a way to hide what you're doing with them will help tremendously.
I think so as well but those who are investing in privacy coins should also invest in coins which are very decentralized, fast and traceable because tracing is also beneficial.
In my opinion, it is better to make your own research and trust your guts.
The most of the privacy coins are undervalued right now.
The best opportunity is to find a
privacy-related project with a low total supply
(less than 100M), that way the price will be increasing much faster.
I recently found one project called
Ethereum Meta, it is related to anonymity and untraceable transaction. They have a very interesting project to build the Anonymous E-Market Place.
They are on
Pre-ICO stage right now, you can check their website:
https://ethermeta.com/Or even better go through their Bitcointalk thread:
https://bitcointalk.org/index.php?topic=2659058.0