Ethereum has achieved a nice network effect. That's why I consider it to be one of the cryptocurrencies that most "future" should have.
But its USP is smart contracts - and smart contracts will be added to Bitcoin once Rootstock fully works. Maybe that will change when Casper is ready - then ETH has also the USP as the "biggest PoS altcoin".
Smart contracts will never be added to bitcoin, please don't spread FUD in the forum. Bitcoin is a different structure than ether. It seems bitcoin haters came together under the thread but this won't work.
I personnally don't/won't support smart contracts on bitcoin. They're very proned to errors.