In actual all this depends at many factors instead of single one .
Right now it is much better to enter in any campaign that are giving sufficient amount of payment to advertise and paying per week at end .But don't go with those ICOs bounty which promises that they will pay after the end of ICO and also don't go with those ICOs bounty blindly which are having campaign manager no trust or very low rank because in that case there will remain lack experience to handle the ICO and also chances that they can scam us in the mid .
But overall at the last 2 year I seen that no one scam bounty program runned in this forum .