The user base for GoFundMe is completely different from Kickstarter -- they're aimed at personal fundraising (e.g, "medical expenses, education costs, volunteer programs, youth sports, funerals & memorials" [1]), whereas Kickstarter is aimed at "projects" with a "clear goal" and a tangible result.
The mechanics of the sites are also very different: Kickstarter projects run for a fixed period, and release money to the project owner only if the project has hit its goal at the end of that period, whereas GoFundMe campaigns can run indefinitely, and give money to the project owner as soon as it's donated. (GoFundMe campaigns can have "goal" dates and/or dollar values, but they usually have no effect on how donations work.)
[1]: http://www.gofundme.com/questions/ under "What can I raise money for?"