  We use the galaxy rotation curves in the SPARC database to compare 9
different dark matter and modified gravity models on an equal footing, paying
special attention to the stellar mass-to-light ratios. We compare three
non-interacting dark matter models, a self interacting DM (SIDM) model, two
hadronically interacting DM (HIDM) models, and three modified Newtonian
dynamics type models: MOND, Radial Acceleration Relation (RAR) and a
maximal-disk model. The models with DM-gas interactions generate a disky
component in the dark matter, which significantly improves the fits to the
rotation curves compared to all other models except an Einasto halo; the
MOND-type models give significantly worse fits.
