Using Solely DevOps as the deployment source, what is the best approach to automate deployment

I'm attempting to automate the deployment from DevOps to Fabric, I've read 2 relatively similar scenarios: 1 of which claimed that the usage of PAT's is the best approach as of now since we are unable to call upon UpdateFromGit using a service principal and another approach which contradicted the first approach and claimed that usage with service principals was the ideal sitation.

There's 2 samples of code which I've made to push from DevOps to Fabric:

Service Principal Approach:

trigger: none

pool:
  vmImage: 'windows-latest'

variables:
- group: your-keyvault-variable-group-name

steps:
- task: PowerShell@2
  displayName: 'Update Power BI Workspace from Git'
  inputs:
    targetType: 'inline'
    script: |
      $clientId = "$(fabric-client-id)"
      $clientSecret = "$(fabric-client-secret)"
      $tenantId = "$(fabric-tenant-id)"
      $workspaceId = "$(fabric-workspace-id)"
      $organization = "$(System.TeamFoundationCollectionUri)"
      $project = "$(System.TeamProject)"
      $repoId = "$(Build.Repository.ID)"
      $branch = "refs/heads/main"

      Write-Host "Fetching latest commit hash from branch: $branch"

      $authHeader = @{
        Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
      }

      $commitUri = "$organization$project/_apis/git/repositories/$repoId/refs?filter=$branch&api-version=7.0"
      $commitResponse = Invoke-RestMethod -Uri $commitUri -Headers $authHeader -Method Get
      $commitHash = $commitResponse.value[0].objectId

      Write-Host "Latest commit hash: $commitHash"

      $body = @{
        grant_type    = "client_credentials"
        client_id     = $clientId
        client_secret = $clientSecret
        scope         = "https://api.fabric.microsoft.com/.default"
      }

      $tokenResponse = Invoke-RestMethod -Method Post -Uri "https://login.microsoftonline.com/$tenantId/oauth2/v2.0/token" -Body $body
      $accessToken = $tokenResponse.access_token

      $headers = @{
        Authorization = "Bearer $accessToken"
        "Content-Type" = "application/json"
      }

      $body = @{
        remoteCommitHash = $commitHash
        conflictResolution = @{
          conflictResolutionType = "Workspace"
          conflictResolutionPolicy = "PreferWorkspace"
        }
        options = @{
          allowOverrideItems = $true
        }
      }

      $jsonBody = $body | ConvertTo-Json -Compress -Depth 10

      $uri = "https://api.fabric.microsoft.com/v1/workspaces/$workspaceId/git/updateFromGit"
      Write-Host "Calling Fabric API: $uri"
      $response = Invoke-RestMethod -Uri $uri -Method Post -Headers $headers -Body $jsonBody

      Write-Host "Response: $($response | ConvertTo-Json -Depth 10)"
  env:
    SYSTEM_ACCESSTOKEN: $(System.AccessToken)

PAT Approach:

trigger: none

pool:
  vmImage: 'windows-latest'

variables:
- group: credentials

steps:
- task: PowerShell@2
  displayName: 'Update Power BI Workspace from Git'
  inputs:
    targetType: 'inline'
    script: |
      $commitHash = "$(Build.SourceVersion)"
      Write-Host "Using commit hash: $commitHash"

      $pat = "$(demo-dev-2025)"
      $headers = @{
        Authorization = "Bearer $pat"
        "Content-Type" = "application/json"
      }

      $body = @{
        remoteCommitHash = $commitHash
        conflictResolution = @{
          conflictResolutionType = "Workspace"
          conflictResolutionPolicy = "PreferWorkspace"
        }
        options = @{
          allowOverrideItems = $true
        }
      }

      $jsonBody = $body | ConvertTo-Json -Compress -Depth 10

      $uri = "https://api.fabric.microsoft.com/v1/workspaces/$(PBI_WORKSPACE_ID)/git/updateFromGit"
      Write-Host "Calling Fabric API: $uri"
      $response = Invoke-RestMethod -Uri $uri -Method Post -Headers $headers -Body $jsonBody

      Write-Host "Response: $($response | ConvertTo-Json -Depth 10)"

Any references in using whichever approach is greatly appreciated.

Thanks!