One of the best and most profitable masternodes of 2019 will definately be Sinovate(SIN)
Their innovative approach that requires you to burn coins to start a node stops insane inflation that many other masternode projects are facing.

The 3 tiers also make it affordable to anyone right now; a small SIN node costs just $620 for an early investor, while a medium node offers the best ROI currently (close to 300%)
▶️ Little SIN 100,000 SIN
▶️ Mid SIN 500,000 SIN 5% bonus reward
▶️ Big SIN 1,000,000 SIN 10% bonus reward

More information:
https://masternodes.online/currencies/SIN-MID/

Trading:
https://tradeogre.com/exchange/BTC-SIN