Jagdpanther Vs. M18 Hellcat-Which was better?

The Jagdpanther (German: "hunting panther"), SdKfz 173, is a tank destroyer built by Nazi Germany during World War II based on the chassis of the Panther tank. It entered service in 1944 during the later stages of the war on the Eastern and Western Fronts. The Jagdpanther combined the 8.8 cm Pak 43 cannon, similar to the main gun of the Tiger II, and the armor and suspension of the Panther chassis, although it suffered from the general poor state of German ordnance production, maintenance and training in the later part of the war, which resulted in small production numbers, shortage of spare parts and poor crew readiness.
The Jagdpanther had been preceded by two attempts at mounting an 8.8 cm gun as a self-propelled anti-tank weapon; Ferdinand using the 91 leftover Porsche-built VK 45.01 (P) chassis from the Tiger tank competition it had lost to Henschel in 1942, and the Nashorn using a Panzer III/IV chassis. Ferdinand proved to be too heavy and Nashorn too lightly armoured and underpowered.
A heavy tank destroyer design based on the 8.8 cm Pak 43 gun and the Panther tank chassis was ordered in late 1942. The full-size model by Daimler-Benz was demonstrated in October 1943 before Hitler. MIAG-built prototypes followed in October/November 1943.
The M18 Hellcat (officially designated the 76 mm Gun Motor Carriage M18 or M18 GMC) was an American tank destroyer of World War II, also used in the Korean War. It was the fastest U.S. tank on road. The speed was attained by keeping armor to a minimum, using the innovative Torqmatic automatic transmission, and by equipping the relatively light vehicle with the same radial engine used on the much larger Sherman tank.
The Hellcat was the most effective U.S. tank destroyer of World War II. It had a higher kill to loss ratio than any tank or tank destroyer fielded by U.S. forces in World War II.