Bitcoin certainly has the first mover advantage, but Steemit is the first implementation of blockchain/crypto that actually has a mass mainstream appeal. That's key, I think.
There are some nice services around Bitcoin starting to emerge that's going to eat at PayPal, but Steemit has the potential to take in millions - and if done well, hundreds of millions of users. That's enough to rival the economy of a country! Exciting stuff.
Also, glad to have invested in Ether after the crash following the DAO heist.