Hey there,
Wondering which criterias do you follow to pick a bounty where to participate?
Definitely should check the team, roadmap, whitepaper, but is there something specific that you consider before participating?
I think aside from what you had stated in the above, you better check also the budget allocation in each bounty categories of the campaign.
Join in the campaign which is asking for the wallet which you need to use is ERC20(ETH), Stellar(XLM), Xem(Nem), Waves wallet these are legit for me for sure.