Wanted to learn more about the difference so asked ChatGPT for a rundown with the context, pretty neat in-depth analysis (assuming it's accurate):
> It's possible that either word could be used in the context you've provided. Both "discordant" and "dissonant" can refer to things that are unpleasant or conflicting, so either word could be used to describe the feeling of seeing a large company using Medium for its technical blog.
> However, there is a subtle difference between the two words. "Dissonant" typically refers to things that are in conflict because of their individual qualities, while "discordant" typically refers to things that are in conflict because of their relationship to each other. In the context of your sentence, "dissonant" might be a slightly better fit because it emphasizes the individual qualities of the company (i.e. its size) and the platform (i.e. Medium) that are in conflict.
> It's possible that either word could be used in the context you've provided. Both "discordant" and "dissonant" can refer to things that are unpleasant or conflicting, so either word could be used to describe the feeling of seeing a large company using Medium for its technical blog.
> However, there is a subtle difference between the two words. "Dissonant" typically refers to things that are in conflict because of their individual qualities, while "discordant" typically refers to things that are in conflict because of their relationship to each other. In the context of your sentence, "dissonant" might be a slightly better fit because it emphasizes the individual qualities of the company (i.e. its size) and the platform (i.e. Medium) that are in conflict.