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My understanding is that the film gives slightly more resolution, but typically gives a bluish view, which some people dislike. Depending on the brand of glass the colour can range from bluish to yellowish. I have purchased a glass filter largely due to the fact that it is more robust than the film, and I would tend to err on the side of caution with solar viewing. I wasn't too worried about the slightly better resolution with the film because in my experience, atmospheric turbulence during the day tends to be the limiting factor. Having said that, you can make up your own film filter for your scope for less cost than buying a glass one.
Cheers,
David
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