A client roams between mobility-peer WLCs where both controllers have dynamic interfaces on the same client VLAN. What type of roam is this?

This is an inter-controller roam because the client is moving between two different Wireless LAN Controllers (WLCs). Even though both WLCs have dynamic interfaces on the same client VLAN, the fundamental characteristic of the roam is the change in the controlling WLC. An intra-VLAN roam would imply the client stays within the same WLC and VLAN. An intra-controller roam means the client moves between APs managed by the same WLC. An inter-subnet roam occurs when the client moves to a different IP subnet, which is not necessarily the case here since the VLAN is the same.