Clearly you must choose the campaign does not base on the budget but also base on the time of campaign last and the estimating number of participants.
One important thing is the sucessful of ICO, so you must choose the good project based on the idea and the powerful of team.
One more thing, you must consider the softcap of project. Now it is a hard time for ICO based on the market sistuation, so some project with high softcap is very difficult to reach.