Evo-9 is my first choice.  The SWR Trident is my second choice.

Reasons:

Evo-9 is a smaller, lighter weight can.  When not using the fixed barrel adapter (FBA) the Evo-9 can allows indexing on the host weapon without removing the can.  Simply pull the can away from the host and turn.  The Evo-9 does come with a FBA.

Machining on both is very good.

Both cans sound very good.

Both cans have excellent warranty and service from their manufacturers.

If I were going to run the can exclusively on a subgun/9mm AR, I'd strongly consider a TROS three-lug barrel and I'd open my consideration to include three-lug cans like the AAC Striker II.  A Striker II will be cheaper than the Trident or Evo with their respective three-lug mounts.  I personally don't like having one can and making it run on multiple hosts.  It sounds good, but in practice I is a hassle to be at the range and pop a hot can off the subgun, swap a few parts and then run it on the pistol.  As they say, YMMV.

All of these cans will work great on a 9mm SBR.

Mark

Quoted: A Striker II will be cheaper than the Trident or Evo with their respective three-lug mounts.

MSRP on the Trident with 3 lug is $720   while the AAC webite shows the Striker II as $750


I pesonally run my Trident on a 5" barrel and I like it but some testing has shown that the 9" barrels with the same  ammunition are 5 - 8 dB quieter and still retain subsonic.

Thanks,

Matthew / SWR

Yep, my bad.  Trident setup for a three-lug is less expensive than a Striker II.

Mark