trios doesnt come with Design capability, only scan. in order to design you must pay for the design software extra. your question is like asking whats best for making a drawing, a pencil or a paper making press. obviously one of these things is limited in its ability to make a drawing.
so to be specific you would be asking whats better, 3shape or Exocad.
i don't know if you are aware of this but that discussion happens almost everyday here in some form.