I've not looked into it closely to see if it's true or not, but I hear that with Indiegogo you actually have to make the payment up front, rather than just a commitment to pay like with Kickstarter. I know that alone puts me off supporting Indiegogo projects. If you have to pay up front and the project doesn't get funded, do you get your money refunded? It is a much less known site though, so a case of a less known host, a lesser known company producing the product, much smaller track record, insufficient advertising, and many other reasons.