Voted for

• Bitcoin is a safe-haven asset (refuge, shelter) for investors, others, are not.
• Many people can’t understand cryptos and are choosing the only one they know.
• Other (please, comment)

Altcoins have a marketing problem -- there are too many on the market and most people don't know what their use-case is.

One coin to watch-out for though is Basic Attention Token (BAT) [download Brave browser if you haven't done so already]. This is something that directly impacts the average internet users daily life, and will for sure prove itself a force to be reckoned with in the near future.