I'm a big fan of sadlak myself. Put one of the aluminum ones on my "loaded" M1a. I like the ability to see my irons through that mount.
Just bought a national match M1a built in 1986 about a month ago and it has an arms 18 mount on it. Works great, but not able to see the irons. The previous owner did however use an arms detachable scope base with a shepherd p3 scope which is nice. Scope comes off easily for irons use and is right back to zero when I put it back on.
Those are the two I have experience with and I like them both with a slight edge to the sadlak.