There aren't only BTC, XRP and ETH. Also, ETH is incomparably better than XRP.
XRP is just a current wave about faster international remittance. But soon the banks will create their own coins based on XRP.
Maybe you would like to invest on those coins as bundles (packages/sets of handpicked coins).
CoinBundle is the platform I recommend, as the first to implement the bundle investing (now there is also Coinbase and its Coinbase Bundle, but CoinBundle came before and had more bundles, and now haves even more).
Instead of thinking which coins to buy, you can see thematic bundles containing choosen coins that are related to each other.
For example, conservative bundle (with Bitcoin, Ethereum..), Coinbasic (inspired by Coinbase Bundle, but known as more profitable), Halal (the first to comply with Islamic Finance) and top 20 (if you want to have the top 20 coins on portfolio)
Hope you like it, so please share what do you think