Those who think that Ethereum is better are because they believe in technology more and believe in what they can see in front of them. People who believe in Bitcoin are because they see Bitcoin being widely used and highly recognized!
There are some factors why we consider ethereum is better than bitcoin in terms of cryptocurrencies. Ethereum is much much flexible and efficient compared to bitcoin, it is widely used since it has a very good transaction speed compared to any altcoins and to bitcoin that makes it much better.