I think holding is a good choice to make our investment safe. People that sell their investment in bear market seems impatient and finally get big losses. I prefer to chose holding because of my personal reason to prevent losses.
But your answer doesn't fit the question what coin do you HODL in 2018, I think if I am going to answer this, I might say I hold some altcoins like REN, BNB, and ETH. I believe in those coins.