Both of them are good coins. If you have much money you can choose Bitcoin, if not let buying Ethereum and hodling them.
Yes, both Bitcoin and Ethereum are good investment. And if you're going to ask about the best investment, I would say Bitcoin. Why Bitcoin? It is because of its high value. It is increasing and letting people to earn high profit even though you're just holding your coins.
Yes i agree, that both coin are good investment and they have posible to increase his value. But for me, i also choose Bitcoin because everyone know's that bitcoin are mother of all coin and bitcoin value is continue increasing rather than before, so we gain a lot of profit if we hold that kind of coin.