On a serious note besides the earlier comment I made about going down the rabbit hole. I own both the Leshiy 2 with .25cal/.30cal barrels and a Huben GK1 in .22cal. Here are some pros and cons between both;
Trigger (GK1):
The GK1 wins hands down. Mine came in at 14.2 ounces out of the box. I might set it a little heavier. Mine doubled when I loosely held it testing the trigger pull with my Lyman Trigger Pull Gauge.
Trigger (L2):
I haven't tested the trigger pull weight on my L2 yet. If I had to guess, I would say it's about 5-6 lbs. I would compare it to a mil-spec AR-15 trigger but not gritty with a little mushy pull. You will hear air releasing if you try to press the trigger slowly. You do have to get use to it for accurate shots at longer ranges.
Magazine (GK1):
Although it's a fixed magazine, the GK1 offers a 19 shot capacity in .22cal and 17 shots in .25cal. That's more than double compared to the L2. Depending on what power level and what pressure you fill to on the GK1 is where it would matter. Magazine loading gates are available for the GK1 to load more than 2 at a time. I did buy an Ares Tactical Loading Gate but haven't installed it yet. I'm still using the factory Huben Loading Gate with no problems.
Magazine (L2):
The removable magazine on the L2 is definitely an advantage. If you're just shooting at paper and in you're in no rush, it wouldn't matter so much. If you're shooting for time, multiple targets, or you have an endless amount of pest to shoot at, a removable magazine is an advantage. There are also several speed loaders available for the L2 if you want to leave the magazine in place.
Safety-wise, the L2 is a better platform. You can remove the magazine or for an added layer of safety, you could remove the stock/air cylinder completely. With the GK1, you will either have to push the remaining pellets/slugs out the front or shoot them out to render it safe. With my GK1, if I leave it loaded, I index the magazine with 2 empty slots. When I'm ready to shoot, I rotate the magazine so it shoots the first shot.
Platform (GK1):
First off, it's a pistol. Yes, you could add a stock and make it into a mini-carbine. Accounting for length of pull is easier with the GK1 compared to the L2. It just depends on what stock you get. I'm not sure if you could swap out magazines/cylinder between .22cal and .25cal. and it might be more involved. Also, barrel swapping is not as straight forward. I don't know enough yet about caliber swaps and maybe it might be easier than I'm thinking. Maybe someone else can chime in on this. Me personally, I like using mine set up as a pistol but I'm not opposed to adding a stock to it just to try it out.
Platform (L2):
The Leshiy 2 is a rifle/carbine. There's no way to convert it to a pistol because it uses the stock as an air source. The L2 is a very customizable platform. From different calibers (.177, .22, .25, .30, and 9mm) and different barrel lengths to choose from. Handguards/forends are available in different lengths and materials (carbon fiber, aluminum). Pistol grip is AR-15 compatible without the beaver tail. Mounting optics is easier on the L2 compared to the GK1. Adjusting for length of pull on the L2 is not as easy compared to the GK1 due to the fact that the stock is used as an air source.
Loudness (GK1 vs. L2):
My GK1 is in .22cal. My L2 is set up in .30cal/350mm right now but I also have .25cal barrels in different lengths. Not really a comparison to .22cal. Just from other owner's reviews, I would say that the L2 is louder than the GK1. When I first shot my GK1 with the factory Huben Shaddow moderator, I was really surprised at how quiet it was. Again, maybe other owners could chime in on this.
Accuracy (GK1 vs. L2):
I haven't had enough time invested in this yet to give an honest opinion. I also haven't mounted a magnified optic on my GK1 to know its true potential.
These are just some of my thoughts. This post is getting a little long winded and I'm just gonna stop here for now.