When it comes to use cases, yes there are a lot many alts which have better use cases rather than Bitcoin, for example EThereum, in terms of usage, Eth is more useful then Bitcoin, however, for the price it still have a long way to go. Cryptocurrency makes Bitcoin increasingly abandoned by some people.
Many people prefer to invest with Altcoin, the reason is simple because altcoin is still cheap and uses good technology and altcoin has a chance to rise in price.