Well... there only is a comparison when you compare them on the price on the markets.
Steem is just what it is, a social decentralized platform. Ethereum is so much more and we aren't even close to see it's full potential as it made DAPPS possible.
So if development of Ethereum goes well Steem will never be able to get even close to Ethereums pricing. Ethereum does have technical and architectural issues, I've written a few posts about it. I believe that Stratis can become the new Ethereum.
Edit:
This may interest you: https://steemit.com/cryptocurrency/@valderrama/will-stratis-overtake-ethereum
And to follow up I wrote a more 'provocative' post: https://steemit.com/cryptocurrency/@valderrama/stratis-will-beat-ethereum-in-2018
I agree. Etherium is more versatile. Steem looks to me like a token in a computer game ... with the advantage of being fungible. It makes and keeps users active. But I think it will attract a lot of silly content.