In no particular order-
-Direct thread suppressor
-A2 birdcage
-Battlecomp if the barrel is 16" or more
One that I’m particularly interested in its the BRT linear comp. Pushes the concussion down range, reduces flash and softens recoil. I only have a few rounds of experience with it.
I’m partial to the BCM line. Effective but not bad ref blast.
6315, but I’m partial, because it’s our design 
A2 based with asymmetrical ports (smaller and shorter ports at 3 and 9 o’clock), same flash suppression as an A2, same noise level as an A2 as well, but 20 to 25% better compensator performance.
[video=youtube_share;mR00fQugd-A]https://youtu.be/mR00fQugd-A[/video]
I have the BRT comp on my 20" rifle, and I like it for a range/hunting gun. It definitely pushes the concussion downrange and doesn’t kick up a lot of dust in the prone (less than an A2, IME).
The BRT and BCM Mod 0 comps I have are visibly less effective flash hiders than the A2 or the AAC Blackout.
I am going to stick with the A2 FH from now on, although I really like the Forward Controls upscale 6315 version.
Andy
We had a hard time trying to capture the effectiveness of the asymmetrical ports on video. The difference is perceivable whether it’s slow aimed fire, or rapid strings and bursts, it’s easier to show it in bursts.
Till we rotated the 12 o’clock port to 3 o’clock, the results demonstrate the effect of 6315’s asymmetrical ports design quite well.[video=youtube_share;jz5M_0ORG3s]https://youtu.be/jz5M_0ORG3s[/video]
I’m a fan of the 6315 too… I have 12 of them.
Something I would like to see from FCD is a flash suppressor that doesn’t require any timing, kind of like an improved A1 flash suppressor.
The problem i have with the 6315 is that it’s too short for a 14.5" barrel. You listening, Roger? 
Lol, yeah I know, I’m not a fan of these extended A2s, though our 6315x does look better, by retaining the portion forward of the BFA mounting groove.
6315KM (Keymo) suppressor mount will be out that also makes a 14.5" barrel non-NFA, so 6315x is on the back burner for the time being.
The 6315KM, what kind of suppressor mount is it? Can you share photos? (Start a new thread, if need be?)
Hmm… I’d buy a few Surefire compatible 6315’s.
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I do like the BRT Covert Comps a lot on SBRs. I have two; one on a 10.3” and one on a 7.5”. I don’t know that recoil and flash are really reduced much/at all; however, blast definitely is. Neither is unpleasant; the 7.5” is particularly surprising in this regard.
Only in CAD drawing, going to production in a month. They’re for Dead Air cans.
Edit: posted in wrong thread
Not much love for the BCM comp. I’m kind of surprised. I’ve been happy with mine.
I have been using the BCM Mod 0 on my SBR, transitioning to all Dead air to support my cans. No issues for me, does not throw “debris” back at me. Not much but a bit more concussive than an A2.
On my KAC I have the Triple tap. Works well for what it is.
I’m happy enough with the one that BCM supplied with my 16" midlength upper. The thing is, its the only MD that I have used on that upper, so I cannot really judge how effective it is as a compensator, but in my experience it does not suppress muzzle flash as well as the A2. 5.56 is loud and concussive from a 16" barrel - I cannot tell a difference between the BCM comp. and A2.
I will say the BCM 16" mid-length LW upper makes for a nice shooter!
Andy
I love the MAMS but it is kinda niche
Ultradyne Mercury: Nothing in my face, no muzzle rise.
I’m a fan of the Surefire Warcomps.
I’ve been debating whether or not to replace mine with an A2. I am less than a novice at changing parts/gunsmithing so I thought I might leave it, but A2 would be more “correct” to an L119A1 clone … so I dunno.