It's tough to decide with precision which investment is better, whether Ethereum or Bitcoin because Both have the potential to yield substantial profits and have advantages and disadvantages. The fact that Bitcoin was the first and most well-known cryptocurrency, with a higher market capitalization and greater acceptability by the general public, is a benefit. Ethereum has the benefit of more sophisticated technology and a larger selection of uses. It ultimately boils down to your risk tolerance and personal preferences.
Personally, I've never really considered investing in Ethereum because I've always felt Bitcoin has more profitability than Ethereum so I can't really say much about investing in it. But like I said, it's a matter of personal choice, I have people who'd rather choose to invest in Ethereum rather than Bitcoin as well as the other way round