On paper it is RChain which is the best. But the problem is they is is all theory so far, they are have many amazing features:

- Sub-second block confirmation time? Seems too good to be true.
- Limit of 40.000 - 100.000 transactions per second? I wish to see that in action.

Until I see working blockchain with all these features and upgrades I refuse to believe in their vision. Deliver first.