To those who have migrated from HAADJ to AADJ. Did you stay (or go with) Co-Managed or go pure cloud-managed?

We are, finally, in a position to start migrating devices to AADJ and I am trying to decide whether to stay co-managed or just go pure cloud-managed.

I realise there's no real downside to co-managed but this is the first step (in a long-term project!) in moving away from on-premise architecture entirely so I was considering going pure cloud-managed with a view to deprecating SCCM entirely at some future point.