For me it is good to invest your money from bitcoin because bitcoin for me is the safety way to earn money because it can gain a huge money from other altcoins.
It will be better if you invest money in different cryptocurrencies. Although Bitcoin is the number one, it may grow not as fast as some cheap tokens. Think over altcoins, which can pump in 2019.
If you are thinking of a much safer side then proceed investing with Bitcoin, it's hard to predict those Alts around, unlike Bitcoin where been used as the main basis of this market, when the bull comes it's way for sure the value of your investment will grow to the point that you will really love.