Bitcoin is mother currency of all coins. So my first choice is bitcoin. After the bitcoin ethereum is second largest coin by market cap and one of the successful blockchain so ethereum is best option after bitcoin. And bitcoin is gold of internet so also litecoin is silver of internet. So yes litecoin is also best choice.
Now lets talk about ripple, it is centralized that's why i don't feel free to invest. Because we love this technology because its decentralized and transparent but in ripple case its a centralized. I'm not saying its bad project but i just shared my opinion why i don't like ripple.
So in my opinion all above coins are good for investment. And my top two choice is bitcoin and ethereum over a ripple and litecoin.