Having etherium and bitcoin is much better. But if I have to choose between the two coins, ofcourse i will choose bitcoin because of the popularity and stability of it. Just look at the value of the bitcoin ten years ago compared as to date, it is getting high.  Many people adopt bitcoin for their transactions, like paying ultility bills, grocery, buying clothes and others. We also know the bitcoin is the highest valued coin compared to the others. I should go for bitcoin in terms of investment. Etherium also is stable, the value of it continuously increasing. Both are good coins.