The Galaxy S26 costs £590.00 new compared with £119.95 refurbished (no longer sold new) for the Galaxy S21. Buying the Galaxy S26 refurbished instead of new saves £30.00. If you want Galaxy AI support and a larger 6.3" screen, the Galaxy S26 is the better choice. If value is your priority, the Galaxy S21 offers the stronger buy at a lower price point.