If you are not so sure which to invest, why not pick all and make a portion of your money to go through different kinds of coins. In that way you are confident enough if BTC falls, then you have your reserves to back-up most of yours loses in BTC. Now if things go wrong (like most your of your invested coins go down) then it's a farewell, but don't worry, most holders within 6 months have gained enough profits. You'll just have to be very careful in picking the right time of the dip, good luck.