I'm a former CPA and founder of Zen99, which built tax tools for independent contractors like Uber drivers. So this is my forte :)
You're right that it's not cut and dry, and can't be. There are too many specifics to take into account. For example, if you're a part time worker at Whole Foods, you don't get to write off your commute to and from work. But as an Uber driver, there are ways you can do this so you pay less in taxes, which can make your take home more than the WF worker. Neither of them get benefits bc part time employees don't have to be given benefits (note: not sure on what WF policies are, but that's a true statement for part time employees in general).
You're right that it's not cut and dry, and can't be. There are too many specifics to take into account. For example, if you're a part time worker at Whole Foods, you don't get to write off your commute to and from work. But as an Uber driver, there are ways you can do this so you pay less in taxes, which can make your take home more than the WF worker. Neither of them get benefits bc part time employees don't have to be given benefits (note: not sure on what WF policies are, but that's a true statement for part time employees in general).