I wrote a song in Db Major, but I could also notated that it would be equivalent to say C# Major as well. I am not well versed in musical theory and I think both are equivalent to each other and wonder if there are situations which there are preferences to say one over the other. If not why. I play guitar and bass so I would love to know.
What I am mainly writing for is guitar, bass, vocals, keys and drums. But there will be some translation from Keys to actual stringed instruments like Violins and Violas with possibly some oboe or clarinets. I have an EWI player too interested in subbing for those wind parts so I would want to make sure he is comfortable with the scale notations.