First of all, check the team. You want to support an ICO that will deliver and really pay you out. Otherwise, there will be of no use.
Secondly, check the allocation. If is a fixed individual allocation, then is perfect. Then based on your rank, followers, readers, go for the ones that you think will give you the highest rewards. Also depends on the amount of time your are willing to invest.
A great ICO that I did bounty for was #Blocnation. They had a fixed amount of BNTN tokens used to pay out. Great project, check it out at: https://blocnation.io/