It won’t make any difference at all for pretty much anything- except how much you enjoy the courses now. Either will get you similar jobs (and your internships will matter much, much, much more in getting those jobs than either major), and either major will get you into any of the grad schools you are looking at. Honestly- go for the one where you can take the more of the classes that are interesting to you.
You can see some different views on the value of an MPP / MPA [url=<a href=“https://mic.com/articles/4870/a-graduate-degree-in-public-policy-is-not-worth-your-time-or-money#.NxsFlZTMn%5Dhere%5B/url”>https://mic.com/articles/4870/a-graduate-degree-in-public-policy-is-not-worth-your-time-or-money#.NxsFlZTMn]here[/url]; [url=<a href=“http://www.governing.com/columns/gov-understanding-value-of-mpa-mpp-degrees.html%5Dhere%5B/url”>http://www.governing.com/columns/gov-understanding-value-of-mpa-mpp-degrees.html]here[/url], [url=<a href=“https://www.washingtonpost.com/lifestyle/magazine/the-education-issue-more-students-getting-graduate-degrees/2012/01/26/gIQAGQTvHR_story.html%5Dhere%5B/url”>https://www.washingtonpost.com/lifestyle/magazine/the-education-issue-more-students-getting-graduate-degrees/2012/01/26/gIQAGQTvHR_story.html]here[/url] and [url=<a href=“https://www.themuse.com/advice/should-you-get-a-masters-in-public-policy%5Dhere%5B/url”>https://www.themuse.com/advice/should-you-get-a-masters-in-public-policy]here[/url].