AGOL Compatibility

Is there anyone here that has used Access Control in ArcGIS Online? I would be very interested in hearing about your experiences with using Access Control in AGOL versus using it with ArcGIS Enterprise Portal.

We have an app in Portal that we are thinking about getting Access Control for, but this app will be moved to AGOL in the next year or so. We just want to make sure we really want to go through the trouble of installing, setting up, and configuring Access Control for this app or if we should go a different route.