The best altcoin for me is just ethereum coin that grows from 300$ to 1k$ so we should invest in this coin this year because maybe it can even reach 2k dollar before the year ends (although the market is dwindling now, but you never can tell what will happen before the end of this year).  the coin is a promising one. if you really want a stable coin the just invest on ripple because the profit will be only good through pump and dump or zcash with a greater amount of value.