For me I always think if their product or idea would sell to public, what I mean if its marketability. Because a project always depends on its community to be able to succeed, If I see the project not getting any huge exposure or either not getting enough support then I would go for them. Right now, there are few projects that wins my heart in terms of this criteria namely OPP and Menlo just look into their telegram group's and you'll see a number of supports they are getting.