Bitcoin is the most popular crypto currency and can be considered as the major crypto currency. Choosing between bitcoin and ethereum? I will choose both because they are both good as investments. Bitcoin is very profitable because it continue to grow and is growing on a fast rate on the other hand, ethereum as the leading altcoin is also important as it is mostly required to be use for making transactions on exchanges like Etherdelta. I don't think that ethereum will ever beat bitcoin on being the leading crypto but when it comes to holding these two make such a good team and as an investment.