Hi HasHe!
The projects are similar but the details are where it really starts to differ. On the whole they are creating a platform for developers to make gaming and gambling applications on. Our project is focusing on eSports with our blockchain based rewards platform built on ethereum. We differentiate ourselves from the competition by only allowing skill based wagering on yourself, as opposed to wagering on others or betting on games of chance (i.e. gambling on casino style games). FirstBlood's function is not considered gambling in the United States and in many other jurisdictions throughout the world.
We also have our cross-title eSports Integrity System that includes Witness nodes to verify game data and our distributed Jury Voting Pool to deal with alleged cases of hacking, cheating, or toxic behavior. This is something that no other similar project has attempted to do (on or off the Blockchain).
Unlike other projects, we've also gone the extra mile by making sure we are complying with existing laws to ensure that the project can thrive. Other projects are violating gambling laws, issuing securities, or have no sort of legal counsel at all. These actions not only have the potential to kill the project, but may put the funders, users, and the founders at risk for criminal prosecution. This field has come under a lot of scrutiny in the last few months and we'd rather not get caught up in that mess, for the sake of the project and our users.
In terms of our token, the primary purpose of 1ST is to enable us to reward people for referrals, running witness nodes (similar to BTC mining), and compensate them for being an active member of our jury voting pool (similar to moderation). The incentives to participate in this crowdsale are nearly identical to the incentives of Augur's successful REP crowdsale. 1ST has similar functionalities to REP (verification and consensus mechanisms) with the added benefit of referral rewards. Likewise, you will always have the ability to use 1ST as a stake for challenging others.