German Fallschirmjäger had pretty bad parachutes. They used the RZ rig which has the parachutist hanging, dangling actually, from his back on one line. It was dangerous to use, and prevented the man carrying any meaningful weaponry. Usually just a pistol and a pocket knife. The man was hanging face forward in his harness and would land on hands and knees, with great of risk of injuries. The jolt of the opening often caused injuries too.
The only advantage I can see was a very low drop height.
The German army was good at re-evaluating and after action reports to rectify previous performance. The performance of Fallschirmjäger were mixed: they suffered severe casualties in Oslo and in The Hague the operation mostly failed. Why did they keep that parachute? Even Luftwaffe parachutes were better.
I have been searching on parachutes, but I'm directed to Fallschirmjäger, not to the parachutes they uses. I was able to find they just the RZ20 parachute, but no reasons why they used that one.