Both of them are quite good, but I prefer ADA. This is a next-generation cryptocurrency developed by Charles Hoskinson, one of the co-founders of the Ethereum project. Cardano is a fully featured, smart-contract capable platform (Equivalent to NEO, QTUM, ETH, etc.) designed by teams of PhDs across three continents, offering far faster transaction speeds, rock-solid reliability, quantum computing resistance, and other bleeding-edge features.