Before investing in any coin, you should compare the percentage return offered by the coins in past few years. No doubt, bitcoin is considered as the leading crypto but ethereum seems to be a better option in my opinion. This is because it is way cheaper than bitcoins and thus the chances of growth are higher. If you observe carefully, a lot of bitcoin share has already been consumed by ethereum which means more people are showing interest in ehtreum these days. I expect this to continue only.