if me i will put 70% in bitcoin, 30% at altcoin.
I trust bitcoin then any altcoin more as i want movement but not be ZERO.
In altcoin one i will put 20% in ETH, Doge. 10% to follow others.
Investing 100% in crypto currencies is also an big risk as you never know what will happen in future so its better to invest some of our money in real world and in real products like gold, silver or real estate where there is no fear that it will disappear in long term so I will never prefer to invest all my money either in bitcoin or in altcoin as the chances of loosing money is higher in digital world in compare to real world.
it's always a better idea to divide your investments and not to inly one. That way you're safe if anything happens to your other investments. I like the idea of 70%/30% btc - altcoib ration though for me i think halving it would not be a bad idea as well as your btc will grow when your alt coins grow.