Big news for many of these currencies being added. However I find it extremely interesting and against the use case for Ripple's "liquidity" currency, as robinhood is 100% retail investors. People buying xrp at this point are only hoping for a quick ride. They're going to find long term that holding currency that only serves value to discount for banks on the ripple network doesn't serve them as investors. A currency of this nature will be held stable in price long term, it needs to be, which is why Ripple is paying market makers to assist in this as well.
what is your suggested investment coin?
Stellar Lumens, XLM. Out of the ones listed on robinhood, would be the largest potential in my opinion. It's a coin capable of breaking out of the correlation to Bitcoin price and stand on it's own legs. Fundementals are strong long term.