I sure would like to hear some of your opinions on the more common brakes.... Lantac for sure
To start with, understand that most of the common dedicated brakes have all tested to show 60-75% recoil reduction and that 15% spread is pretty hard to pick up on unless you're swapping brakes back to back on the same rifle in a range session. Even then 15% is pretty minor on the shoulder dyno.
What sets them apart once you're in that upper end of diminishing returns is the flatness, or how much of the gas is directed upward to push the muzzle down.
The Lantac is one I've shot on buddies rifles and screwed on mine very briefly for giggles but never owned. It was quite a while ago but I remember it being light, having less recoil reduction than my brake at the time (Seekins ATC) but being flatter.
As far as other common brakes go:
JP 3 port, weirdly overrated. Not that flat, not great recoil reduction. I won and use one but wouldn't have bought one.
JP 2 port, similar to the 3 port but I felt maybe a hair flatter.
Seekins ATC, good performer that is noticeably less concussive than most brakes.
DPMS Miculek, great performance to dollar ratio but the only brake I've owned gave me a headache.
SJC Titan, tested but never owned, top level performer even though its ancient technology. Great fireballs too.
PA M4-72 is one thats deceiving to look at, tons of recoil reduction in a small brake, pretty flat. Fireballs!
Lancer Nitrous is underrated, works very well on my 14.5" gun.
Cobalt Kinetics Pro brake is titties, wish it had enough good surface area to drill some tuning ports into it though. Really like it on my 16" but its moving to an almost finished 13.7" build now. Seems more effective on the 13.7", possibly because of the higher pressures at the muzzle. Very weird brake for bystanders, not concussive but sends a strong breeze to the sides...
Surefire ProComp falls squarely in the okay range.
My current favorite is easily the PA Hypertap. Really the only brake I've owned that stands noticeably above everything else in the recoil reduction department, and I drilled out the top ports to my liking and its shooting ridiculously flat.
I've got the APA Answer and the Ultradyne Apollo on my list of brakes to test also.
I'm sure I've left out some I've messed with too....