But you need to keep going back to the SSO console to switch accounts because only one can be active at once. With GCP you can have multiple tabs open with different accounts.

The best part is that the account is in the URL so you can just link to specific resources in different accounts. So many of our runbooks for GCP are like "click this link" whereas for AWS it is "make sure you are looked into {specific-account} then click this link". The latter is much more error prone and can break your workflow if you were doing something in a different account previously.