Almost 1 billion market cap for something almost nobody use? I don't think it's underpriced.

Bitcoin have 6.5 billion, but there are a lot of people, establishments and companies accepting and using it. And there will be a halving in the next few months, something you'll just see again in 2020.

If you need to choose an altcoin, I recommend to keep an eye on Lisk, for all the reasons we told in the previous posts and much more features.