Kahr has a website, and there you can find complete statistics that will allow you to compare the two. You can order a CW9 from Buds gunshop website. The last time I looked, they were $369 delivered. You just have to line up an FFL holder to do the transfer.
The EMP is a nice pistol, and would make a good range gun. I would not recommend it for defense use until you have a fair amount of shooting experience.
The reason why no one knows about the older metal S&W's is that they don't sell well, and gunshops will tend not to carry them. Most people want a high-cap polymer pistol instead....