Reference using the below links migrated site successfully.
Error Message
Set-SPWebApplication: An update conflict has occurred, and you must re-try this action. The object SPWebApplication Name=SharePoint Sites was updated by domain\serviceAccount, in the OWSTIMER process, on machine SPServer. View the tracing log for more information about the conflict.
As per henry blog, I feel best to follow the steps 3 & 4 to avoid the above error message...
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Error Message
Set-SPWebApplication: An update conflict has occurred, and you must re-try this action. The object SPWebApplication Name=SharePoint Sites was updated by domain\serviceAccount, in the OWSTIMER process, on machine SPServer. View the tracing log for more information about the conflict.
As per henry blog, I feel best to follow the steps 3 & 4 to avoid the above error message...
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(After Migration we did not use Point No.7)