So I'm having trouble figuring out what to do with a story. It's about 75% written, but I'm having trouble landing on how I want to format and tweak it once the first pass is done. It's got some sci fi kinds of elements, so it might be difficult to produce if I wanted to make it IRL.

When you have a story, do you always have the format in mind? What makes something work best as a play, movie, tv show, or other medium?

I know all of you are going to say "write it first!!" and I'M DOING THAT, but help me understand what the advantages and disadvantages are.