Dash is digital cash and like real cash it allows users to send payments privately and instantly online or in-store, however rather than holding funds in a bank account users store coins themselves meaning they have full control over them.
Dash has a few features which make it stand out as a cryptocurrency including;
InstantSend which means that your transactions can be confirmed in less than a second which is about as close to actual cash as seemingly possible. This is also a lot faster than most other cryptocurrencies, PrivateSend which means your transactions are protected by keeping your history and balances private, to send transactions privately it uses an improved and extended version of the CoinJoin,
Two Tier Network, Self Governing, Self Funding Protocol among others. To me, this makes Dash a better coin than Neo.