Bitcoin if you can afford to but there are bigger profits if you hold hundred thousands of an altcoin because a cent of increase will already give you higher profit. This is also the reason I I kept holding the altcoins I think has better potentials in the future when the product is almost released. A million of Dogecoin will already be worth more $100K when price rise up to $0.10.
Well for me its depend to your Altcoin if it has a potential then possible can give you more profit but it doesn't mean that it is much profitable to Bitcoin. To get huge profit then invest large amount but make sure your investment is possible to increase or have potential so that your money will grow even more. I recommend to invest to those top cryptocurrencies like Bitcoin and Ethereum because these crypto are really worth it.