The iPhone 17 Pro costs £1,095.00 new compared with £399.00 refurbished (no longer sold new) for the iPhone 15 Pro. Buying the iPhone 17 Pro refurbished instead of new saves £346.00. If you want a larger 6.3" screen, the iPhone 17 Pro is the better choice. If value is your priority, the iPhone 15 Pro offers the stronger buy at a lower price point.