Of course invest in bitcoin will give you more profits rather than in the altcoin because few years later i think the price of bitcoin still higher rather than altcoin. But if you don't have much money, because 1BTC is too expensive, you can buy and invest in altcoin. I suggest you to buy ethereum because the price is more stable and higher rather than another altcoin. Nowadays, ethereum be alternative for people when they want to invest in the crypto's world but can't buy bitcoin. Because of that the demand of ethereum always increase every month.