Bitcoin is the first, the biggest, the sanest, the nopremine, no tricks blockchain. Bitcoin has the biggest amount of brainpower behind it. Bitcoin has the biggest market cap, liquidity, and brand. Bitcoin is the best crypto for government resistance, and the victory over Bcash, and soon over segwit2x, shows the determination of the community to ability to fully utilize it all over the world and behind anonymization network like Tor etc. Bitcoin has its scalability vision ready (Lighting Networks). Bitcoin is the killer-feature of the blockchain, and the only reason blockchain makes any sense.
Ethereum is just a pump for people that think they've missed the boat on Bitcoin. That's why it grew up so quickly, and people are willing to throw so much money at whitepapers with nothing behind them. Ultimately, Bitcoin can do anything that Ethereum can - it's just a matter of time before it will suck the marketcap out of ETH, just like it did with many other cryptos.