Rewards can be distributed in any ERC-20 token, NEP-5 token, Ether or NEO. That being said, rewards can also be distributed in BNTY, but that is not the main functionality of the token.
When should I distribute rewards in my own token?
Distributing rewards in your own token or coin can be a fun way to align the incentives of your community and sometimes a more cost-effective way of compensating work. Before pursuing this further, please make sure that there are no legal aspects in your jurisdiction that might not allow distributing payment in your own coin.
When should I distribute rewards in a major cryptocurrency?
Major cryptocurrencies like Bitcoin or Ether are seen as acknowledged as being "legitimate" by most community members in the cryptocurrency space. Therefore, it can sometimes be easier to find Bounty Hunters to complete work if it is compensated in a major cryptocurrency