Sorry, I don’t understand. As I understand it, both MADI and AoIP allow integration of equipment from multiple vendors.
I think it is a matter of ‘horses for courses’.
From the ‘outside’, MADI appears geared for those with mass I/O requirements, and budgets to match!
When lower I/O count devices are available, AoIP would appear to be the better and cheaper solution for smaller initial setups, but scalable and flexible enough to expand to anything up to large multi-room studios, without obsoleting anything along the way, and using cheap network equipment and cables to do it.
Also, AoIP is routable, whereas MADI seems point-to-point, making the former fully remotely configurable when using managed switches.