of course the difference is very far away. not even just etherum, but bitcoin is also a very far comparison between 2017 vs 2019. all coins fell by almost half the price. but bitcoin can be better than etherum because the increase has now reached half of the price in 2017. You are not wrong to exchange etherum to bitcoin, but etherum also has the same opportunity to be able to go up high in 2020, we'll see.
They do have different story, as we all know in Bitcoin there's a group of people maybe a company or what who can actually manipulate the price of it, while in Ethereum, so far it has a positive sign that although it is not a dump/pump scheme it's getting stable that for everyone is still a good choice as it does not dump too hard when the price of Bitcoin dumps dramatically. So, for the conclusion according to experts, Ethereum is a good way source of investment.