Why choose from the two if you can always do both of them. Bitcoins, we all knwobthay bitcoins are considered the one of the successful investment here in the world. But today bitcoins are dropping its value that leads to a world wide panic. It is because of the china banninemg all the cryptocurrency in their country. On the other hand, altcoins it is hard to find a reliable altcoins instead of ethereum, for me ethereum is only the one who have a potential in the altcoin industry. So my advice for a long time bitcoins and ethereum.