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!
Completely agree with you. Everyone promotes in the best way the thing that believes in very strongly. And everyone will give lots of arguments that will be really true that the exact xoin is the best - wheather it is Bitcoin or the Ethereum. But they are quite different and their history is different, and both of them have lots of people who believe and like these coins. But it is hard to compare them - different coins..