I own both, they both are very nice. I am partial to the Matrix pro, but really if you can get behind both I would try them both out. If you are referencing the original matrix vs the ACC then the ACC would win that. But the matrix pro vs the ACC, then the pro. Only gripe I have about the Mpa is the cheek rest support rods are too short to extend the height and still be able to lock them down. they sell longer ones for like 20 bucks which once changed out fixed that one issue. But overall it’s a great chassis. They both are. Also look at foundation stocks. I have never shot one but they are incredibly popular in prs and supposedly have a more dead recoil impulse vs a chassis.