Kudos on the new opportunities. Can you negotiate for more with Company B? If that’s where you want to get experience seems like the best choice. And hopefully opportunities to grow there.

Having moved cross country I know it gets expensive quick and if Company C isn’t picking up the relocation tabs I’d steer away. While the salary is attractive I’m guessing taking less is Michigan is better financially. Unless you’re seeking a change and getting out of Midwest. Plus if you’re stressed out in CA and don’t have the support system you may have an even harder time adjusting - especially while we’re still not near normal times.