I've been cutting ornaments for 12 years and use 2 thicknesses. In hardwoods, it's always 1/4" and for the baltic birch plywood my clients prefer 1/16". I can cut 10 at a time in that thickness, but really prefer just 5 or 6 so I can use a #1 blade.
My new favorite blades are the Pegas modified geometry, but I only use the #1, because they are basically the same as Olson Mach blades, and I still have a ton of those in sizes 3,5 and 7. Really only use the #3. If they made a size #1, I'd have never found the Pegas. These blades leave the back TOTALLY smooth, with no sanding required. Now I don't know what to do with all the Flying Dutchman Ultra Reverse #1's that I have left. Don't care to use them because of all the sanding required on the back.