I can only speak about one half of information which you are looking for, but my information is very fresh...
Last night, I was scaling down some of my free-hand air-brush stencils using a Silhouette Cameo 3 on good-quality 80lb. card stock. The smallest one which worked out included 180 degree curves which were exactly 1/4 of an inch wide. Those cuts are smooth and flawless.
I tried a few which included tighter cuts such as a 3/4 inch wide horse silhouette with separate strands for hairs along the main and tail. The legs on that little guy are clean and clearly articulated (great detail) but the tail is just a pulverized puff of macerated cardboard. I think the cutter could have handled that tail if I were working in thin vinyl or transparency film. It was the cardboard that failed, not the cutter.
The only downside to the Silhouette is its cutting speed. I filled a 12x12 inch page with 16 small stencils, each between 1-4 sq-inch and involving lots of curves and interior openings. It took the machine about 10 minutes to cut that whole page.
I don't have access to a laser cutter, so hopefully another forum participant will give you info on that option.