Dark or light theme of Instagram content?

Starting to put together some marketing for my app CrispPlan (a took for creating and planning social media content), and think that Instagram carousel tutorials are a good, relatively low-effort way to start building a following.

Created some initial mock-ups, but cannot decide between a light or dark theme: https://twitter.com/dkrape/status/1264953098776297474

Anyone have thoughts? (Would like feedback on this sort of marketing too.)