You have to feel the advantages of film astrophotography over digital by your heart. If there are some objective measures that are better for film than for the digital sensors, then I can't recall them. If you are doing astrophotography for your own enjoynmet, you have the choice. If you are doing science, you don't have the choice. If you can't resist the social pressure, you don't have the choice either.
People have various reasons for shooting on film. For me, the main reasons are these: 1) Film produces nicer images of bright targets for my eye. Here you can find many examples of film images:
You can compare them for example to the images you can find in the digital forums of CloudyNights.
2) I see little sense in producing images that is the internet full of. I want to be original. Digital can produce deeper and sharper images than film using the same telescope/lens. But why should I strive to take deep and sharp images when someone with better sky and equipment can take them even deeper and sharper? This would have no contribution.
I used to use both film and CCD for several years. I eventually sold the CCD because using it made me more unhappy than happy. With film, it was the other way around.