Well, first of all, I would consider two coins that are ETH and Litecoin. Most of all I like the ETH, as this coin has a strong community and great potential. This is currently a very undervalued coin.
ETH still commands the support from a very large and loyal user-base. And the second thing is that it still enjoys more than 90% monopoly as far as the smart contract platforms are concerned. The competitors such as NEO, ADA, QTUM and Stellar have lost their value against BTC continuously for the past 1-2 years and the number of tokens created using these alternative platforms are showing a decline. The only point of concern is the performance of the ICOs. Back in 2017, the ATH was attained solely due to the ICO craze.