On mobile, we have been purely iOS for the past years, but will soon be absorbing a company that is purely Android. Assume all upcoming android device as company owned. 

1. Which is better enrollment "Corporate-owned, fully managed user devices" or "Corporate-owned devices with work profile"
2. Wil it be better to factory reset the mobile devices prior to enroll, or just enroll. Note we are strict on DLP.
3. How do we ensure that once android device is enrolled that it is on our tenant "forever".

Thank you