Partly personal preference, and partly that some adhesives are better for certain situations. I use ATG for most things. Zip Dry (or Glossy Accents or Scotch Quick Dry) when I need a stronger bond. Foam when I want to make something stand out and add dimension. Xyron and 3M Spray Mount for vellum. Xyron, Spray Mount and Zig pens for tricky/delicate/lacy things. I also use Glue Dots because I have them, but I will probably not repurchase them when I run out.