Everything. 

Few other coins have such dedicated developers who are bringing the same features, that would usually be hyped up by other altcoins, without any fuss. They take every suggestion into consideration and are not afraid of criticism.
Also, they have brought us a number of services that other coins do not have and a lot of interesting things are in the works.
This coin has been distributed very equally and has a strong and involved community.
The identities of all the developers are public and you can even call them or skype with them if you want, which is extremely rare in the crypto-community.
This coin is only a few months old yet has had more progress than most other coins in such a short time. Furthermore, many merchants are also accepting Sterlingcoin.
There are so many other things that I probably forgot to mention.