What each role can do

• Editor can change the form (questions, logic, theme and settings), publish it, and read its responses from their own account.
• Commenter can read the form and leave comments on questions, but cannot change anything.
• Viewer can see the form and its responses, and nothing else.

#Choosing

Editor is for the person building alongside you. Commenter suits a client reviewing wording before launch. Viewer suits somebody who only needs the results.