Ok. Just got the Nyko Perfect Shot in. Bit of a difference in size, eh? This gives a fair idea of how much more moment the AMS has over the Nyko. My very un-scientific assessment so far is that the AMS is more accurate, but definitely feels heavier because of the length. The wiimote fits more snugly in the AMS, and you can leave the strap on. In the Nyko, there is a little play left and right, maybe 1.5mm. Might not matter too much though since we all know a wiimote isn't going to have the accuracy of an actual light gun. Seems like you have to take the strap off for the Nyko. The Nyko has a cool pass-through for the nunchuck, which could be handy for some games. And i definitely don't get as tired holding it. The AMS doesn't have a pass-through, but just a small hole in the back and a slot to fit a nunchuck cord in, which would shorten the cord considerably. But then if you need a nunchuck, just use a different gun...
The Nyko trigger is a bit firmer, which i like. The clip looks a little flimsy though, and i don't know why they went for orange. Would anyone REALLY think this is a real gun?
About the weight. I'm pretty weak in this regard. I get sore really easily. Most people will last longer than me using the same equipment. As an example, one round of Point Blank and i need a rest! Therefore the difference in weight might not be so noticeable with other people.
I don't know which one i prefer really. They both look cool. But one looks James Bond cool, and the other looks Dirty Harry cool (",)