I'll look at the google trend search volume of "Manifold Markets" and "Kalshi" over Dec 2024 and visually decide if Manifold Markets have more search volume than Kalshi
https://trends.google.com/trends/explore?geo=US&q=%2Fg%2F11y32h_nbl,%2Fg%2F11thczw14_&hl=en
Resolves Yes if Manifold Markets has higher google search volume than Kalshi over Dec 2024.

If someone in the comment session came up with a more rigorous method of determining which term has a higher search volume, I will like use that method for resolution.

Edit: I changed the google trend to a better comparison after the suggestion of @joanna