I have experience with VMC and AVS a little. But what you are looking for ?
In my opinion, this is always physical VMware cluster
There are few differences... depends on you need:
- minimum cluster size ==> VMC 1 node(POC), 2 for PRoduction but in AVS must be today 3 node cluster
- permission level (rights to specific vCenter settings) ==> VMC is more for me how SaaS... in AVS i feel more components you can configure... but maybe I'm wrong..
- different interface for networking management... VMC has different interface (from few months started deliver additional access to part of NSX-T interface also) , in AVS you have full access to NSX-T
Differences are mostly in HyperScaller levels.. Integrations can be challenging but good to learn this.
How can i help more ?