AD User migration to new domain

I have SharePoint site in Domain A with 1000 users. There will be new domain B setup. I need to migrate ShrePoint Site from domain A to domain B. The AD users SID will remain the same. Below are two possible solution

1. Install new SharePoint in Domain A. Restore the site from Domain A to Domain B. Migrate all 1000 users using move-Spuser or Stsadm command.

2. Change the domain for System hosting SharePoint. Then migrate the 1000 users using move-Spuser or Stsadm command

Will the permission remains same in case user is migrated or what can be other issues.

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