# Differences between custom and default workspaces
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**Important**  
New Amazon IoT SiteWise features, such as [https://docs.amazonaws.cn//iot-sitewise/latest/userguide/custom-composite-models.html](https://docs.amazonaws.cn//iot-sitewise/latest/userguide/custom-composite-models.html), are only available in `IoTSiteWiseDefaultWorkspace`. We encourage you to use a default workspace instead of custom workspace.

When using the `IoTSiteWiseDefaultWorkspace`, there are a few notable differences from using a custom workspace with asset sync.
+ When you create a default workspace, the Amazon S3 location and IAM role are optional.
**Note**  
You can use `UpdateWorkspace` to provide the Amazon S3 location and IAM role.
+ The `IoTSiteWiseDefaultWorkspace` doesn't have a resource count limit to sync Amazon IoT SiteWise resources to Amazon IoT TwinMaker.
+ When you sync resources from Amazon IoT SiteWise, their `SyncSource` will be `SITEWISE_MANAGED`. This includes `Entities` and `ComponentTypes`.
+ New Amazon IoT SiteWise features, such as `CompositionModel` are only available in the `IoTSiteWiseDefaultWorkspace`.

There are a few limitations specific to `IoTSiteWiseDefaultWorkspace`, they are:
+ The default workspace can't be deleted.
+ To delete resources, you must delete the Amazon IoT SiteWise resources first, then the corresponding resources in Amazon IoT TwinMaker are deleted.