https://cloud.google.com/bigquery/docs/authorized-views#row-...
The comparison in the source doc (https://cloud.google.com/bigquery/docs/row-level-security-in...) seems to list the same caveats for both methods.
I think of row level security as enforced on the table which is stronger as it will apply for any reads on the table.
However, if you have authorized views then you can still create a different view of the same table without the access controls.
You can probably use both to solve the problem and in some cases authorized views maybe the right choice and in some cases row level security will work.