Stratis and QTUM are good coins with good tech.  Long term they will grow for sure.  You might as well throw NEO in on that list and Monero.  All have great tech and could grow ten times over time.  Those are easy calls to make imo because they are all fairly well established.  The 3 I mentioned have very good tech as well.  In 2018, I like these three under the radar coins.