NEO is great as an alternative to Eth, but its quite different from Cardano in my opinion.

Cradano is a solid long term project that aims to solve some important crypto issues like scalability, security, flexibility. But to do that, the team is taking its time to make sure the final project is flawless. That means that Cardano is unlikely to be a NEO or Ethereum killer anytime soon. And even when it is fully rolled out, Neo will already be well established, it won't necessarily disappear.

There is room for more than one coin!