Maybe you choose both currencies between bitcoin and Ethereum. This two currencies has both good features and for now on ethereum is going down it value and it is the best time to invest on it. While bitcoin is in the high price but it is also good to invest on it because bitcoin is continuously increasing it's value right now. How ever if you select this two currencies as your investment it will sure you gain a high profit.
A both good crypto currency your right but we will gonna based on the chart, bitcoins done more on trading and more profitable than the etherium, traders must use primary knowledge like knowing a chart history in the two called cryptocurrency "bitcoin vs etherium".
But as you said, any of the two will give us money ! Thats what good in cryptocurrency.
The two will have the long run and a potential to be our primary use of cashless planet in the future, but also no one can predict a perfect value and we may lose but life isnt about giving up, its about giving the best to the fullest able to achive the target.