let's take an exemple ,bud:
"X have better durability than Y , but if someone stabs X with a knife , he'll die just like Y would."
durability will help you if you're being punched or kicked , it can do **** when you're being blows with a lariat
Well firstly your example is about stamina and life force. Durability would call into question if the stabbing to person x would have as much of an impact as it did to person y.
the Heavenly Transfer Technique was supposed to rip Tsunade to shreds, but it didn't because of her durability. Katsuyu protected most people from the crushing power of Shinra Tensei, Tsunade however withstood it without Katsuyu.
Now for life force. Neji died from splinters in the back. Tsunade had her entire stomach ripped apart with Madara's sword. Something that would have instantly killed other Shinobi but Tsunade still impaled fought like a champ through it. Yasaka Magatama to the face would have normally killed any shinobi but Tsunade was completely unfazed.