Bounties would be better than airdrops, in my opinion. Cause i noticed almost all bounties projects have their own milestone to archive and they work for it. Moreover they get listed on exchanges more than airdrop projects where airdrops tokens listing so rarely nowadays. But if you can join them during the right opportunity come then thus way, both method can be helpful and profitable for participates.
alot bounties campaign also be shit too ,not all milestone that planned by Dev team running well , even none of it well done. Airdrop have good value too ,especially on retroactive airdrop which be really user on defi platform. Both of them worthed as long as we find correct projects. Airdrop program more variouses,sonwe could which one of them.