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The proof is in the numbers.  Brand X's shroud line attachment failed at 1.0 lbs.  The shroud line ripped through the plastic parachute and the reinforcement tape ring.

Mercury's U-Ty shroud line attachment actually did not fail at all, but the shroud line did break at 5.5 lbs.  The U-Ty attachment scheme is over 5X stronger than the typical model rocket tape ring/plastic parachute scheme and, for this test, stronger than the shroud line material.
Quality Model Rocket Kits
                Engineered for Performance
5.5 lbs.
1.0 lb
Brand X Pull Strength per Attachment
U-Ty Pull Strength per Attachment