To my knowledge today the 2 best things are ripple and raiden on ethereum.
Ripple is centralized and can be argued is not even a blockchain.
Litecoin is fast AF but its the "younger sibling" of Bitcoin.
One to keep an eye on in 2018 in Cardano here's the introductory whiteboard talk https://www.youtube.com/watch?v=Ja9D0kpksxw