The year 2018 will be the time for privacy and fast transaction
So I would bet an XRP (very fast, little fees)
and XLR Solaris less known but with zerocoin protocol, also fast and little fees for transactions.(POS, POW and masternodes are also advantages here).
Defninitely be careful about investing in bitcoin, more and more people are leaving that boat. We will see if it will not sink.