Yet another vote for Anonymous cryptocurrencies...they are going to explode in 2018. Choosing which coin would be the most profitable in the short or long term can be extremely hard.
My picks are: Pivx is is very good project with POS3.0 and zPIVX/Dash fork. What I dont like is about masternodes (just like dash), no Ring Signatures and no TOR integration. SpectreCoin Spectecoin has both and it also comes with Stealth Address (OBFS4 coming soon). Hush and Komodo are more evoluted, with Zerocash and zkSnarks. I also like Monero with Stealth Address and multisignature transactions. Anyway all privacy coin lacks some feature today and it's hard to find the best compromise...so sometimes you should choose just which coin would be the most profitable in short or long term. PIVX, Monero and Komodo market caps are all high ...not easy to gain here. Maybe long term...but not more than 2X unless you invest HUGE. DeepOnion comes with lower market cap (now!) and nice set of features (best to come...so it will grow more than others).