The Cardano project is almost like the ethereum project in terms of application and purpose, but it also has new features. According to the creators of this network, cardano blockchain is made with philosophy as well as research.
I think the main difference between cardano and ethereum is their algorithm. The ethereum algorithm is similar to PoW bitcoin, where network miners are rewarded for the mining power they give to the network, but PoS rewards are based on the amount of assets, which is a big difference.
I think the cardano network currency, the ADA, will be one of the most profitable currencies in the years to come, which is a great investment opportunity.