There are Huge number of Projects using Polkadot network to create smart contracts,
please open below given link to know more about progress/development Polkadot accomplished, during 2020.. The beauty of the network is it uses Multiple chains concept to execute transactions which reduces transaction time substantially. Its popularity is growing with every coming day.
https://polkadot.network/polkadot-2020-roundup/Well, you are right that lots of project comes in Polkadot blockchain network. And also polka dot generate a huge amount of market cap volume. But that's not enough to compete with a project like ethereum. Firstly you have to understand that if polkadot network choose lots of project then othersite lots of project also choose ethereum network. So here is a huge competition and you choose a moutain hill type competitor like ethereum which is world 2nd largest market cap volume generated project and people's 2bd choice and trusted crypto project. So it us nit easy. But in this place we can say both are best from their own place. I hope you must be satisfied with my replied.