While you can make generalizations about the kind of people who buy iPhones versus the kind who buy Androids, they’re usually not fair. But, objectively, there does tend to be a price disparity between iPhones and Android devices.
Apple products aren’t cheap. If a user can fork over the money for a $1,000 handset, there’s a good chance that they’re also able to pay $400 for a smartwatch. Android devices are much more diverse in price, which means they’re more attractive to budget-minded consumers who may not be able to justify buying a smartwatch.