Is this a better Wii gun than the Perfect Shot gun? And, it doesn’t appear to be available in the US yet.

That’s an excellent question, but you’re not going to like the answer. Aside from the different features (notice the "Mr. Smith" gun allows on-device Nunchuk access, for example), most Wii ’light guns’ and gun shells will have varying results for different users. The major problem lies in that the Wiimote’s point of aim relative to the screen isn’t always one-to-one with where you’re pointing. This is fine if you have a cursor on-screen to compensate and are using the cursor as your point of aim. It’s potentially not fine if you’re using the Wiimote or a gun shell as your point of aim, because the ’barrel of the gun’ may be pointing in a wildly different position than the Wii reads it as. This is normal behavior for the technology.

How well any given Wii gun/shell works depends on where you’re standing in relation to your TV, lighting conditions, how big your TV is, where your Wii Sensor Bar is, how long your gun/gun-shell is, how tall you are, and so on. Just due to how Nintendo’s Wiimote technology works, what does fine for one user may be useless for another, and the opposite could be true with a different product. It’s why I had trouble issuing a universal recommendation for a pretty well-built Wii gun I received for review a while back. The gun’s construction and features were fine, but results in use were all over the place.

Wii guns are one of those peripherals you really should find a way to try in your normal play environment before you buy. The problem is making that happen; most stores will not let you rent one, and returning it if it doesn’t work for you may be problematic since you can’t prove the device is truly defective, just not right for you.

I’m sorry that’s not a quick and easy Yes or No answer, but that’s how I currently understand Wii guns and gun shells. Thus, the products you’re asking about... well, one might be better for you, and worse for someone else. I really cannot give you a definitive answer.