As for me it is quite hard to say for sure because they are both strongly damaged after big dump in the firth quarter of 2018. But now Ethereum seems to be more perspective. Somebody even wait for ETH to be miner 1 the next year.
agree, even on the way ethereum more shows a better rate of increase even in investment, but still in a situation where ethereum can't outperform bitcoin may not even happen because it is true the creation of bitcoin is the first coin and maybe another creator can't also replace it because that's the crypto and the good start.