Running a successful project requires a lot of dedicated time and attention. Accordingly, we recommend focusing your efforts on managing just one campaign, on one site.
Kickstarter is all-or-nothing, and bringing all of your backers to a single place increases the chance of getting funded. Using a single platform for your project also cuts down on the confusion of sending multiple links and will help get your idea off the ground.
We see projects succeed where creators have a focused and comprehensive outreach strategy — which could be diluted by spreading your efforts across multiple funding platforms at once. While you may find your community is enthusiastic about backing you on one platform, they may be less inclined to back you in multiple places.