Narrowed it down to 3.

I got the veteran because of the trigger. Great gun, no mods or tuning necessary. Don't like offhand shooting with this gun. I have another bullpup that I like offhand shooting with. The Vet is clubby. Great in the sandbag or on a bipod. No need to make it more quiet. More noise from the reg and valve than what's coming out the barrel. Don't know what a mouse fart sounds like so I cant help you there.
 
I have 2 of the 3 you mentioned (not the Vulcan) and my 25 Veteran Shorty is the most consistantly accurate and I have two 25 caliber Crickets which appear to shoot identically. I have two of them in 25 because a friend needed money for an emergency and used it for $1500 collateral and promised to buy it back for the same price and never did and it was a brand new gun he just bought (SOME FRIEND).

The Veteran is not as pretty as the Cricket if you are into looks but I can get sub MOA with Polymags and JSB 25.4s at 100 and the Cricket a hair larger than that but not with the Polymags.

The Crickets are quieter but they are longer but IMHO still not backyard friendly.

I would suggest the Veteran shorty in 25 with a HUGGETT and a DonnyFL threaded adaptor.

It has a better trigger and really compact and sort of unreal power for such a small size. This thing is SMALL! I would suggest it even if the prices were the same.

I could have told you the 25 Cricket since I have 2 of them in the same caliber to try to sell you one of mine but the Veteran gets my vote. I like the Veteran more than my 25 Edgun too which is more accurate than both of my Crickets but the trigger is the one thing I really don't like about my Edguns.

Haven't ventured into the Vulcan territory, I have some personal reservations about the magazines reliability when it comes to hangups and not affecting accuracy since no one answered my question about how reliable the magazines are otherwise I may have one right now. I have this pet peeve about magazines and don't want to be forced to single load a repeater in order to get good accuracy.

Hope this helps


CA


 
I got the veteran because of the trigger. Great gun, no mods or tuning necessary. Don't like offhand shooting with this gun. I have another bullpup that I like offhand shooting with. The Vet is clubby. Great in the sandbag or on a bipod. No need to make it more quiet. More noise from the reg and valve than what's coming out the barrel. Don't know what a mouse fart sounds like so I cant help you there.

The Veteran has the best trigger out of all of the bullpups I have ever shot. I shot mine straight out of the box without cleaning and it did MOA at 100 out of the box with nothing done. It is not back yard friendly in my case and a mouse fart is something like a Crosman1377 or 1322 shooting with only one pump or quieter than that or a Daisy 717 or 747 or a 177 regulated Marauder or half as loud as a Beeman R7 or HW30s probably quieter than that.

CA
 
Can't speak for the other two, but I love my Crickets (.22 and .25) The .25 is longer than the .22 but I find it acceptable for the backyard (that, as mentioned many times before, is subjective), and I love the trigger and handling. Only gripe I found was the loading procedure, but that was solved by getting some drop in machined plates from Donnyfl.
 
I have 2 of the 3. KG 🦗 in .22 & .25 as well as the Veteran in .22.

The GA airguns Power Tunned .25 🦗 is mouse fart quiet for sure using a Sumo. Without the Sumo is really not very loud at all. But yes, mechanical noise at your ear is a bit loud. Only you will hear this though. I have not shot it to 100, but folks that do are hitting small spinners at that distance. At 50 yards it’s a ragged hole. 

The .22 Mini Carbine 🦗 in .22 is my favorite, but it’s a .22 and you are looking for .25. AoA claims to have them in .25, but I don’t know if this is factual and if so, how they perform. 

The Veteran has a few things going for it. I’m no trigger snob, but even Ernest says it’s the best trigger out there. To me, they both are equally good. It is a chubby SOB. Very quiet. One of the nicest features in my book is the anti double loading. That being said, I never shoot it, don’t know why. Except I always grab my Mini. 

I think between these 2, you cannot go wrong. If you choose the Cricket, I highly recommend GA Airguns. Superlative service and integrity. 
 
I can only speak for the Cricket. Mine has the power tune by Charlie Frear at Georgia Airguns. This bumps up the power to 62 fpe and increases the air capacity for more shots per fill. I get 50-60. Charlie will also install an adapter on the existing shroud so that you can add more sound suppression if you wish. DonnyFL, makes good products here. While I agree that the trigger is kind of mushy, mine is very light. I also recommend the sideplate by DonnyFL to make installation of the magazines easier. This gun is lights out accurate. I recommend it as well as Georgia Airguns. I think there are more options available for Crickets for further modifications if you wish, but it's pretty good right out of the box. If they introduce a mini-carbine version of this, I'd sell mine and get one of those. I like that new configuration.
 
Don’t have all three but I do own a Georgia power tuned Cricket. Haven’t taken her out past 60 but shoots lights out at that range. Had Charlie add a Sumo on the gun and she shoot pretty quiet. Shot a boar with a sow about 10 yards from him. Didn’t even phase her when I took the shot. Mind you the Coqui’s were singing that night. Neighbors only know when I’m shooting because of the sound of the pellet impacting the target and that’s if they’re outside. It’s kinda long compared to my gen 2 Vulcan (not Vulcan 2) especially with the Sumo attached. 

I’m not a great shot but my Vulcan shot as accurate as the Cricket. I’m thinking about ordering a 30 but don’t know if I want a Bullpup or Tactic. Waiting to hear reviews.