At the end of the day, the only thing I think Ethereum really has, at this moment, over Steem is the name recognition.
Ethereum gets people using the ERC20 and 21 protocols because that is what is known and out there. Steem-Engine could make a lot of headway by tapping into that market. The selling points listed here are hard to argue.
I believe a big difference is that the ERC20 smart contracts were added to the chain while the NFT contract is added to the Steem client software. Ethereum has a smart contract language where you can add new contracts into the chain and processed by the Ethereum client software.
This really is the big difference. The fact you don't have to trust a company... just their blockchain. But Steem does have a crazy amount of perks.
Absolutely, the speed and the amount of data stored on chain allows for many things Ethereum can't do.