I have both the A419 brake and Insite Heathens, and I prefer the Heathens. I think they are a more refined brake.
In my experience the jam nut on the A419 brake has a tendency to get carbon locked, the threads must be really fine. The brake gills are also not radiused, so they are super sharp. When the jam nut gets locked up and you decide to try and remove it with some muscle and bare hands, you find out very quickly how sharp those ports are.
Also, all the ports on the A419 are directed back at the shooter. Effective for mitigating recoil, but all that blast and concussion is also directed back at the shooter. That concussion takes a toll on the human body, it beats you up after a full day of shooting. The Insite Arms brake has the main port directed perpendicular to the shooter, to direct blast away from the shooter. That creates for a more pleasant shooting experience.
Both do a great job mitigating recoil, but one design is more refined in my humble opinion.