Champaign with payment in bitcoin or ethereum will give us certinity although its price cheap when bitcoin price drop. But if compared with token Bounty , no one could guarantee that we will received our Bounty reward. As we know many dev team cut bounty allocation , or even didn't paid at all. Working in this Champaign sometimes will make us angry or bored to do Bounty task.
You can take part in signing bounty to pay for bitcoin and Ethereum if you are selected and in a category to support signatures due to strict rules. Not everyone can follow the bounty signature with bitcoin or Ethereum payments.
Some differences can be observed if you check the main requirements for both kinds of signature campaigns. The BTC or ETH paying campaign managers are looking for quality posters while the token paying bounty campaigns have no such restrictions on every board. The token-based payments have a better vision considering the future valuation in case of listing on good exchanges.