Quality is more important than any other consideration.
The reviewers are interested in your ability to visualize three dimensional space and form. Preference is not given to digitally created works. The reviewers are also interested in a conceptual basis for works or a body of work. For this reason, it may be appropriate to compose a portfolio determined primarily by consistency of ideas represented. Likewise, it may be appropriate for those with a technical background to include work which demonstrates your approach to visual problem-solving.