Both have different vision and uses. I feel both have their advantages and disadvantages. There can be two perspective to know which one is better. One can be from the perspective of price. Since Bitcoin is first of its kind, carries the market sentiment. Ethereum can not surpass the price of Bitcoin though it can grow as much as Bitcoin now, but by that time Bitcoin will be way more than from now. So if you are looking for good returns, you can invest in Bitcoin more than Ethereum.Second perspective can be of technology. If you talk about technology, Ethereum has more potential than Bitcoin. Ethereum is solving general world’s problem using blockchain. So if you are more from technology, you can explore ethereum.