Surefire open tine flash hiders ping annoyingly (at least for me) but once you mount a can it's a non issue. Brakes on SBR's, on the other hand, are extremely obnoxious and uncomfortable when not suppressed. A brake can act as a sacrificial baffle with suppressed, though, so that's something to consider.
I have an open tine warcomp on one rifle. I don't notice any pushing of the muzzle one way or another with the ports timed almost exactly straight up and it's not very loud (for a brake) when unsuppressed.
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