Is there a good reason to use Waves smart contracts compared to Ethereum or Cardano?
1) ETH is PoW, can handle less transactions per second and gass is required which makes it expensive
2) Cardano has no working platform yet and smart contracts are expected Q4 2018 - way overhyped project in my view
Waves, has already a working DEX, ICO platform, LPOS algoritm, super fast transactions with Waves NG and smart contracts are now already in test. In my view, only thing that can match Waves technically is NEO platform.