It would have to be the Uragan... the Vixen bottle is the same setup (ergonomic awkwardness) of an Air Force product.
Having previously owned a Talon SS, and currently owning a Vixen Long, I will have to say that there must be other aspects of the AF guns which lead to that feeling of ergonomic awkwardness. The Talon had it in spades. The Vixen, OTOH, is very comfortable to hold and shoot, and I'm only just getting used to it now as a new gun to me. But I don't feel like I need to adapt to it to shoot it. I just go out and shoot.
I will say that I never got really comfortable shooting my Uragan King. Much of that was the fit of the Uragan's stock to my shoulder - I'm tall and have longish arms. And all Uragans appear to me to use the same stock. Once a factory defect got handled on my King, it was a fine shooting gun - but just not for me. So that kind of took the Compact out of the running for my next gun.
I also thought about Kalibr Cricket 2 Tact 45, or even AirMaks Katran CB, but ended up wanting the lighter weight of the Vixen.
There is one other thing I have noticed about the Vixen in my initial shooting with it. We all know that these guns are not known to be powerhouses, especially the 'standard' or 'short' version. But if it can just make the power you want/need, there is an additional benefit. My Vixen shoots pleasantly smoothly and, while it is the long version, it is very quiet. Not just the muzzle report (or total lack thereof), but also the mechanics of the gun during the shot cycle. Very pleasant overall.
We all try to attain some state of harmonic tune in our guns. Many times we get our guns shooting really nicely, but fewer times we really nail it and get a gun shooting 'perfectly.' It becomes totally smooth during the shot cycle, gets quieter than it was from the factory, and accuracy becomes outstanding.
I think that since AGT maybe wasn't attempting to achieve mega-power with the Vixens, these guns may be arriving from the factory in a very pleasant and accurate state of harmonic tune. I can only say this based on an n=1, but that sure is how it feels to me with my new Vixen. Just a real pleasure to shoot right out of the box, and I actually may end up turning its power down just a bit to get closer to about 880 fps with the Hades pellets.
Good luck with your choice. We all certainly are blessed to have the choices we have today regarding some incredible air guns.