The main differences between a wavy baking tray with frame and a tray with lower crossbar mainly concern their construction. Both trays are designed to perform the same function during processing but vary in their structure. The tray with frame is known for its robustness, often used when specific resistance is required or when it needs to be integrated into automatic machines. On the other hand, wavy baking trays with lower crossbar are lighter as they do not have a frame, thus simplifying maneuverability and bread unloading thanks to the open side that facilitates the process.