I have or have used the Anvil, BH-55, and MH-50. All can be used for any purpose, but I’ve settled on the Anvil for mounting a rifle, and the ballheads for spotter/binocular attachment.
The independent panning feature of the ballheads is great for optics. And while not necessary for match use, the ball heads, especially the MH-50, allow huge angles of articulation.