1. Reverse Recovery Time (trr): The VS-1EMH01 features a trr of 15.2 ns, while the ESH1B's is 25 ns. This is the fundamental difference. The faster switching speed of the VS-1EMH01 results in lower reverse recovery charge in high-frequency applications like switching power supplies. This translates to reduced switching losses and smaller voltage/current spikes, which benefits overall system efficiency and noise performance. 2. Product Series: The VS-1EMH01 belongs to the "FRED Pt®" (Fast Recovery Epitaxial Diode) series, which is known for its optimized soft recovery characteristics. While the ESH1B datasheet does not explicitly detail its recovery behavior, the disparity in trr values indirectly suggests the VS-1EMH01 likely offers superior recovery performance. This advantage can help mitigate inductive turn-off ringing and lower EMI. 3. Reverse Leakage Current: Although a minor difference exists (2 µA for VS-1EMH01 vs. 1 µA for ESH1B), this parameter is of the same order of magnitude and has an extremely low absolute value. For most practical engineering purposes, this difference is negligible. The price differential primarily reflects the distinct performance grades in switching characteristics outlined above.