I was recently faced with the same question/issue. For me the difference is that "regular mesh" is part of ArubaOS and the controller environment, while "mesh network" is part of the AirMesh product line running MeshOS. We have a policy that all vlans are tagged on trunk links and that was not possible with ArubaOS (the management vlan had to be untagged). We are now using the MST200 for point to point bridging.
I guess that the question for Verotiana is, what are you trying to accomplish?