They both have their advantages and disadvantages
Old Bounties
Payouts and rewards are extremely very low,ive earned 10$ for promoting a old bounty project for weeks.
Very low?? What campaign you have joined bdw? Do you ever joined old bounty at 2017? I was got around $2800 with only make 1 article and 1 video.
New Bounties
New bounties always brings the highest profits as per details derived from hunters.
Always bring profit? Could you elaborate which campaign did you mean about this one? In this current condition, bounty just more risky then gambling dude, just open your eyes.