iOS - Auto Layout vs Different storyboards for different screen sizes

I know this question has been asked several times, but i really need a precise answer. I have an app that is finished with several views, but the problem is that it's built for the 4-inch screen. I have been struggling with Auto Layout for a while now. My buttons in the main page are either too large, or the same size as the 4-inch, after i play with the height by 1 pixel ( i was using the equal widths and heights ). I can't make them the way i want them to show. I've seen many videos, read articles including Ryan Wenderlich, but couldn't make it work. The question is the following: I know it will take time, but can I use different storyboards for the 4.7 and 5.5 inch devices instead of Auto Layout, and later on submit it to the App Store ? Because i don't think it will work with Auto Layout. Please be understanding. I'm using Xcode 7 beta 3. And whenever i play with constraints, Xcode crashes, which made me want to use different storyboards even more

via Chebli Mohamed