In the past I have owned many revolvers chambered for the 45 ACP cartridge. I still have a couple of S&Ws
And an Italian made Model P clone.
If all you need to do is shoot 45 ACP cartridges, either will work for you, with the nod going toward the Model P because it is similar to your Cimarron. If target grouping is your goal, the S&W will be in the forefront of your search.
The Single Action does not use moon clips, the S&W can but it is not necessary (in the older models). Moon clips are availble in two styles, steel
http://www.ranchproducts.com/
and polymer
http://www.ezmoonclip.com/
I have the ones from Ranch Products and can find no fault with them. A fellow shooter uses the RIMZ clips and has much good to say about them.
The Single Action can be loaded rapidly using the magazine from a 1911 as a ammuntion holder.
There are lots of good reasons to own a revolver chambered for the ACP cartridge, I can not think of a bad one.
In the past, I have had others, (Ruger and Taurus), but sold them off as they were not what I needed in a revolver.