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!
Eth is better tech wise. Bitcoin still has scaling issues and is still slow going to exchanges. However, eth, while being better, is not the chain that should be most used for icos and Dapps. Their are 4th and 5th gen blockchains that knock the socks off both and are way more scalable and useful for dapps