Putting all your money to ethereum will be risky. I must preferred to bitcoin or bitcoincash. It has the more higher value than ethereum. But whatever cryptocurrency you provide for your money or investment, there is always a risk. All you need to accept what would really the risk of it.
Yes, you were right,bitcoin has a lot more potential than etherium so if we want to invest or buy coins it would be best to buy bitcoin,as we can see bitcoin pumps now.. but of course if we doesnt have much capital and can only afford less than bitcoin, etherium will be agood choice.