@Aravind A Thanks for reaching out.
You can find the best practice for ADMT and how to Migrating and Restructuring Active Directory Domains at our download center :
https://www.microsoft.com/en-us/download/details.aspx?id=19188
Here are some more related information, through which you can make a guided decision,
For more information about migrating/ restructuring AD, we can refer to the links below.
Active Directory Migration Tool version 3.2
https://www.microsoft.com/en-us/download/details.aspx?id=56570
Active Directory Migration Tool (ADMT) Guide: Migrating and Restructuring Active Directory Domains
https://www.microsoft.com/en-us/download/details.aspx?id=19188
ADMT Series – 2. Preparing the ADMT Machine (including ADMT Series – 1 to ADMT Series – 11)
https://blog.thesysadmins.co.uk/admt-series-preparing-the-admt-machine.html
ADMT Series – 1. Preparing Active Directory
ADMT Series – 2. Preparing the ADMT Machine
ADMT Series – 3. SID History
ADMT Series – 4. Password Export Server
ADMT Series – 5. Machine Preparation
ADMT Series – 6. Service Account Migration Wizard
ADMT Series – 7. Group Account Migration Wizard
ADMT Series – 8. User Account Migration Wizard
ADMT Series – 9. Merging Users with a Different sAMAccountName
ADMT Series – 10. Security Translation Wizard – Local Profiles
ADMT Series – 11. Computer Migration Wizard
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