Bitcoin has the largest, and therefore most secure, network. This makes Bitcoin the best store of value coin. It however does have longer transaction times and higher fees, making it good to use in place of a savings account or for high value wire transfers.
Bitcoin cash is a "fork," or variation derived from, the original Bitcoin. Though it has much faster transaction times and much lower transaction fees, some have speculated it's not quite as secure as the original Bitcoin. Though we can't confirm or deny this, to us Bitcoin Cash seems like a suitable replacement for checking accounts and debit cards that have a frequent flow of value.
Monero has relatively low transaction fees, and moderate transaction times until completion, though it is often possible to verify a transaction is in process relatively quickly. Monero is concentrated around privacy, and is a suitable replacement for cash!
"Dash advocates itself as peer-to-peer decentralized electronic cash. It intends to be as liquid as real cash which we use in our respective countries like USD/GBP/EUR/INR or CNY.
Dash is built upon Bitcoin’s core code with the addition of new features (such as privacy and quick transactions)."