No two are exactly alike!
The key to differentiation is a method of validation, much like steem it should have working systems.
Proof-of-Work | Proof-of-Stake | Proof-of-Space | Byzantine Agreement
The most important piece is the blockchains that form it.
If you genuinely want to understand the Bitcoin phenomenon, you need to take a look at the underlying technology. The thing that makes not only Bitcoin but Ethereum, Litecoin and other cryptocurrencies so intriguing is the blockchain on which they are built. Whether Bitcoin eventually reaches a million dollars or crashes and burns, the underlying blockchain technology is unlikely to go away. Instead, the blockchain is likely to find its way into banking, retail transactions, and even the ballot box. Have a lookout for Beyond Steem, Pretty sure you will like it.