Not always, because I choose undervaluated coins as well! To my mind some of them can perform good and become next ethereum.
They are hidden gems, you know.
I also choose coins that have great potential and which are platforms for smart contracts. this is the best option for investment
I also support Ethereum, Cardano, NEO, and Waves as for me, these are the altcoins with the best potential. However, some new tokens can grow in 2019 as well. I would also pick them.