As a bounty hunter or from hunters point of view, Tron is a better choice as from my experience, projects on tron appear often, as well as manage bounties more often. In last 2 years, I've participated in 4 bounties based on Tron blockchain and only 1 on Stellar.
Plus, you need to spend few XLM to activate your wallet and get reward, while with Tron you can do everything for free.