Blade selection usually ends up as a matter of personal preference. If I have ever used the blade that the pattern maker recommends, it was totally by coincidence. Not that I don't think they make a good recommendation, just that any recommendation is really just a suggestion. Proper blade selection is a factor of wood thickness, hardness, pattern detail and even the saw itself. You need to find the right combination of blade size and material to cut the desired pattern. This will vary from one user to another and from one type of saw to another.
Me personally, I cut most fretwork with either a #1 or #3 FDUR. When cutting ornaments, I typically try to use stock that is thinner than 1/4" (either 1/8" BB ply or hardwood planed down to 3/16" or so). I usually use the #1 and keep my overall stack thickness at around 1/2" max, give or take. I use a #1 because most of the ornament patterns I cut have a good bit of fine detail in them and the #1 gives me the best results. I could try to stack cut more, but then the #1 wears out faster and cutting slows. I could move up to a #3 to speed things up, but then I lose some of the control and ability to cut fine detail that I get with the #1. It becomes a compromise. Your mileage may vary, which is why all blade recommendations are just suggestions.