There is a lot of difference with the different angles but they are also different from material to material.
In combination with different line spacing and crosshatch, you can get nice effects on your material, especially for relatively large surfaces / objects.
I can only recommend you to use some different material types and run some tests. Surface treatment before and after engraving is also a little science in itself.
In picture no. 1, 45 ° Cross-Hatch with 0.5 line spacing on ABS has been used. (approx. 175% enlarged image)
In picture no. 2 it is very interesting to see the difference in color. All I did was brush the wood with a baking soda / water solution, let it dry and break the surface with fine sandpaper. Finally a little beeswax, just to see the effect. Material: BB plywood
