But the big difference between the two is security. Eth network is 100x or maybe 1000x secure than steem. It is totally decentralized unlike steem which has a huge amount of premined coins that could be dumped in any moment.

Steem inc and the founders have complete control of the blockchain because they own about 40% of the Steem. They could use it to vote on witnesses who shill for them and do exactly what they want. (Just like facebook.)

They can also crush new investors by dumping huge amount of steem in the market. That is not going to happen with ethereum.