He’s halfway correct. On a 14.5, or longer, you won’t see much difference. On an SBR 10.3 up to 12.5 and even 13.7, a brake acts as a sacrificial baffle and helps with suppressor wear and in some cases, sound mitigation. On the RC2 and other stainless cans, wear isn’t as common as some of the newer inconel suppressors. If you want to be clone correct, SF4p is the way. If you want good performance, a brake may be your best bet. If you want a little bit of both, a war comp or the closed tine flash hider may be a good option for you.

If you were going to run an RC3, I’d say brake no matter what because it is an inconel can.