Some notes on page titles specifically;
Consider these titles;
From the perspective of Google, which ones will likely be shown first, if someone in Auckland types "best pizza"?
From the perspective of your clients, which titles look good, give the best information, and will make them want to click when they see them in search results ( SERPs ).
Make sure to review your Titles for all of your pages.
For Collection Pages, make certain to craft them using Collection data so that each item is unique.
Google's Best practices for influencing title links