i will answer with my version, why bitcoin is more popular than ethereum? because bitcoin is the first, many people more know bitcoin than ethereum, so the price and the popularity are high. i have an analogy, do you know neil amstrong? why he is so popular? because he is the first person that arrive in moon, and do you know  Buzz Aldrin? i think you dont. if you google that name, you will realize that  Buzz Aldrin are an astrounout that arrive in the moon after neil amstrong.