In my experience, they both work pretty well. I prefer enhanced leaf personally but that is just my preference, no real reasoning behind it except that I have had more successful sessions with it.
With either method, you'll want to use the least amount of direct flame possible. Like for enhanced leaf, I just light a corner with a standard lighter and then let the cherry do the rest of the work. Similar technique for sandwich method, by lighting the upper layer and letting the cherry do the rest of the work.