There should not be a lot of overhead for rendering as a minimalistic Spine skeleton compared to a Unity Sprite
. Mesh generation of a simply skeleton will not take a lot of time, and after generating the mesh, it will be rendered just as a normal MeshRenderer's mesh, applying batching, etc.
Nevertheless, we would recommend to try this out once with one of your static assets, placing it 200 times in your scene as a skeleton, then switching to a version of the scene with Unity's Sprite
in use. You can then precisely measure the actual overhead that it will cause on your target device.
Also be sure to export your skeleton assets in binary format (and not as JSON), so that loading time and memory allocation is minimized.