It all boils down to what your university requires as well. Some universities may require a bound dissertation, while others may accept soft-bound versions, depending on the department. In any case, you have to be aware of the cover color, spine lettering, page size, and number of copies required by checking the graduate school requirements. Dissertation binding must be done accurately as even a minor mistake can lead to reprints of the whole document. Do you still need to print the documents in your university?