Bitcoin and Litecoin are two good coins but the best option is certainly in Bitcoin, Bitcoin has now dominated the market so the quality is unquestionable now the Bitcoin price is still not recovered so I suggest to buy it now.
the main coins that we should buy are the only bitcoin and we can buy at any price. and we can buy any coins except to buy litecoin because litecoin can increase higher for a long time. but for now, I think it's better to buy bitcoin first because the price can increase in anytime so we don't miss a good time to sell and make a profit. this will be good for us if we have a lot of money because we can buy a lot of bitcoin at a low price.