Mine is professional feasibility, enjoyment, and ease of use and I see the world through those eyes. I got very tired of spending all those hours in the darkroom on a daily basis, and love working in the light. Half the time I'm on APUG I'm working on the other computer right beside it retouching and printing. I absolutely get that people who work on computers all day are sick of them.
So I agree that the love of the process is a major reason for people to use one or the other.
I'm like someone who is English speaking, learning to speak French and translating it all in their head for a long time before it becomes natural.
My experience with digital was to mentally translate analog to digital in almost everything I did during the transition, which was scan first for a year then shoot digital later.
But for me it was a goal oriented reason because I needed to use Photoshop.
Not many people have reached the nirvana of unfettered creativity.
Most people have an "action" or a "plug-in" in their brain during the process, but I get that the ease of the actual computer ones can overpower "immature" photographers.
BTW, if I want to get a "6x6" look, I can crop. I've never felt limited by the ratio of the "sensor" dimensions in analog or digital.
I wonder if anyone's done a double-blind test lately. My gut feeling is that we're at the point where no viewer could possibly distinguish which images were film and which digital in a pool of well-produced examples, but I can't prove that.
Agree with ntenny and that was basically my point earlier. Barring extreme procedures, in a blind test I doubt anyone can tell the difference at this point. The "film is better" or "film is different" argument may have applied earlier on, but by now the digital technology is so good I really think if we're honest with ourselves as analog workers, the only truly valid reasons we have for working in analog are that we enjoy it (and don't enjoy computers) and that it is what we know how to do. It isn't about differences in the final product anymore. At least in my case, I can't reasonably take that position. It's just that I love working in the darkroom, I love the workflow with film, chemistry etc., I love working under the enlarger, and these are skills I've worked hard on. I don't want to re-learn how to do it with software, and have no interest in that process. It wouldn't be enjoyable for me. I started photography in the darkroom, and I'll finish it there. If a time comes when I can't buy the materials anymore, I'll just allocate more time to my other hobbies.