The most underrated coin, in my opinion, is DeepOnion (as you may guess from my signature ), it's developing fast, has a strong community, and going to be listed on exchanges like BitIndia and Cobinhood soon.
I'm actively posing on steemit, so I'm also a steem-holder. Though I don't think it may do x10 or x100 in a short time, it's definitely not an unprofitable investment.
Also, OST (Simple Token) looks promising they are simplifying blockchain for a regular business, and I think it's an amazing idea.