I think Bitcoin Cash is a better investment than Bitcoin because it's less volatile and I think it's better to diversify your portfolio.
I know there are people who disagree with me on this, but I believe that if you're looking to invest in cryptocurrencies, you should invest in both Bitcoin and Bitcoin Cash. And why not? They're both cryptocurrencies! The value of one doesn't have to take away from the other—they can coexist peacefully in your portfolio.
Bitcoin Cash is more stable than Bitcoin because its price hasn't fluctuated as wildly as Bitcoin has over the last few years. If you look at a graph of their prices since they were both introduced, you'll see that the peaks and valleys for both coins are very different: Bitcoin has had much more volatility than Bitcoin Cash, which means it's easier for investors (like me!) to predict what will happen with their investments in either coin.