For me it is absolutely impossible to choose between them. In my opinion both coins has great potential to grow in future. We should not limit our investments to only one coin...
I don't think it's difficult, there are several considerations for choosing an investment between these two coins. bitcoin and ethereum have a large market, although the value of these two coins is very far. therefore the investment we make can be based on the amount of capital we have. if you have a large capital to invest maybe bitcoin is a good coin, but if I suggest a small capital it's better to be interested in ethereum because the price is much cheaper than bitcoin, the profits can be greater.