I prefer digital over film, mostly because of the costs involved. A good lightning image in a storm that is cooperating takes what could be described as a heavy amount of exposures to catch. Out of a good night I might end up with a couple hundred exposures. And out of those only 20-30 might be really interesting or have something of merit. Out of those, only one or two might be really good. Hence, digital makes sense because the development costs alone for film in this subject makes it worthwhile.
This does not mean I will not use film and in fact have a couple very special projects that require it.