Like everyone said, go to a boot-fitter if possible, but if that is not possible then I would say SPK. I've tried on both, also have a wide foot, and the full tilts killed my foot. SPK's run a little bigger than full tilt in what I've seen, and also pack out fairly easy. So buy maybe half a size smaller than your normal shoe, or if you play soccer, buy them the size of those boots. Hope that helps a little.