I can't say much about the Vanguard or the Sub Moa, as I've never had one. I do have a rem sps ss in 30-06. Syn stock has the r3 recoil pad and the xmark trigger. I like both. Gun currently shoots about 1 inch or so depending on me. It seems light weight but does not seemingly kick much, with some decent handloads (165 gr at about 2800 fps, I think). Just put a Nikon monarch on it, and I really like it. This particular gun will see the woods numerous times this year.
Best of luck in deciding,
Deerandduck