While I love Fantasmic and it is indeed quite unique, there is something about the Electric Light Parade that makes it my very favorite Disney show ever. It is just exudes happiness! You are also a little more likely to have other opportunities to see Fantasmic (for example, if you go to WDW). Combine that with the greater ease of seeing ELP and the fact that it appeals more to children, I would recommend it. Even better, find a way to visit DLR or WDW again soon so you are able to experience both.