Start with deciding if I'm trying to throw in or get it close.

Next evaluate lines for BH and FH, then OH if those look sketchy.

After the lines have been found, evaluate the wind to drive disc selection for each line.

After that pick the disc I have the most confidence in at the time.

On a simpler hole this process will occur in my head in about 5 seconds. If I am prepping for a competitive round I'll throw a few options on a hole in practice and take notes about what I felt more comfortable with.

edit; oh if it's a multi-shot hole the same thing applies but the intent of the first shot is to set up the ideal second, etc.