out of these three syscoin is the hidden gem of 2018.
Syscoin was initially described in a 2014 draft whitepaper that envisioned Decentralized Marketplace Creation, Decentralized Smart Contracts and Documents, Decentralized Certificate Issuance and Transfer, and Decentralized Data Storage and Retrieval, as among the services that it will offer upon its release.
about Pivx, Pivx is seen as the only true competitor to DASH. A lot of the team members are from DASH. It is the only true masternodes alternative to DASH. PIVX is at the same exact state that DASH was at this tis time last year. DASH had mostly lost attention, sitting at around $13. Fast forward to 2018, DASH is now sitting around $443. The same could easily happen with PIVX.
Imagine if PIVX could follow in the footsteps of DASH! And SYS is going to be a masternode alternative too! I really like both.