Stock makes a big difference in felt recoil as well. Both the .338 NM's I have shot a good amount have Manners EH-1's, only difference is the one with the Terminator is 2 lbs heavier. Recoil is very similar between the two, with the heavier one not being quite as sharp, but that is to be expected being heavier. Both of them have significant blast, both have great recoil reduction, both are top tier brakes in my opinion, cant go wrong with either. I think the Terminator series looks a little better, and the MBM brakes work a very small amount better depending on application, and are cheaper. I wouldn't hesitate to use either.
Another good option for a lapua not mention is an APS Painkiller brake. It's up there with em too. What I recommend is to go to youtube and look up the videos that Natan from MBM and the owner of Terminator brakes have made to see how they compare to other well known brakes. Those videos will get you well informed.