Why not go with Polkadot, there has been some rapid growth and development in that space for long time and I think it's good we have a competitive project for Ethereum. Not really a project that will displace Ethereum but they are on their path trying to bring scalability we have been actually waiting for.
Cadano isn't bad but I think the reason behind the recent pump recently is because of the rumor about their listing on Coinbase exchange. Buy the rumor and sell the news, they may dump on you at all time high, wait for correction and stack some ADA