I'm by no means an expert, but I'll add in my two cents!
And just a quick note, I am using Mac Stitch, so there may be minor differences, but overall I think they're the same.
In PC/Mac Stitch, you can export as a PDF automatically. Go to the Import/Export menu > Export > Export as PDF. There, a window will pop up that gives you a whole bunch of options, like what way you want the pattern (symbols, color blocks, etc) and whether or not you'd like a preview photo. Lots of customization that will give you exactly what you want, and it's all done for you (my old pattern program required me to export a pattern, export a photo, export a color list, and I had to put them all together...this is so much easier!)
The files in the demo mode are just there so you can see what a pattern will look like in the program, how it will be when it's printed, etc. In the demo mode there's not much you can do with them, it's truly meant as an example. The full version has all sorts of motifs, and you can create your own as well.
As for the fonts, the full version I have has a LOT of fonts, all very different. I'm not sure if that's a demo vs full version thing, or something else. Have you increased the font size? I know sometimes the default is a small size and that can make it difficult to read them clearly.
I am VERY happy with the investment I've made in Mac Stitch. I can't speak for everyone, of course, but I haven't been disappointed in anything that it can or cannot do. I would recommend checking the version list to see which version would be best for you, if any, keeping in mind the restrictions that are placed on the demo version.
Best of luck!
