EOS is one of Ethereum's current competitors, Ethereum has many disadvantages when compared to EOS from Consesus Mechanism, Transactions Per Second, Transaction Fees.
And then Vitalik Buterin answers all issues with Ethereum 2.0 combining these key projects:
- Proof-of-stake (Beacon Chain, Casper FFG)
- Sharding
- eWASM
If EOS can achieve instant, free and millions of EOS transactions per second, it will be very difficult for Ethereum to match that level of performance. However, if Ethereum can implement Proof of Stake, Sharding and Plasma successfully, I think it will be tough for Ethereum alternatives to pass Ethereum.
I think we need a year to determine who will be superior, i hope Ethereum 2.0 can provide a new life for Ethereum.