The advantage of the German potato masher style grenade was that once thrown, the soldier could then run in, following the grenade. The allied soldier, after throwing his grenade, would dive to take cover, or turn and run the other way to escape the blast and shrapnel, but could rely on the destructive radius of the blast to more effectively clear his target area.
As already mentioned, allied soldiers did not pull the pins with their teeth without risking breaking teeth. They also avoided carrying the grenades with the pull ring buttoned to their shirt unless the spoon was secured carefully and the cotter pin was spread very wide. James Jones, author of "The Thin Red Line", stated that the grenade was the most dangerous and mistrustful of all weapons. The fuse was supposed to be five seconds standard, but a fuse cutter who was sick, tired, distracted, or hung over could wreak havoc with a box of grenades. He talks of fuses going off early and the resulting fear of some soldiers to hold on and count before throwing the grenade.
I had also heard once that the German stick grenade could catch on the thrower's clothing or gear as he extended his arm behind him to throw, but have not read anything to prove this. I did read that they were equally suspicious of their grenades, especially towards the end of the war. Consider that many of their weapons were being manufactured by the unwilling hands of forced labor.
Just for comparison, add the Japanese style grenade. It was armed by impact; rapping it on a hard surface before it was thrown. I have read multiple accounts of the arming device failing and the grenade going off instantly and unexpectedly. It was common practice for Japanese soldiers to tap the grenade on their helmets before throwing to arm them, and many Marine and Army accounts of the soldiers being blown up by their own grenades. I wonder if some of the suicides witnessed in the Pacific fighting were really unintentional detonations by a Japanese soldier trying to throw one last grenade.
Great nations do not fall because of external aggression; they first erode and decay inwardly, so that, like rotten fruit, they fall of themselves. The strength of a country is the sum total of the moral strength of the individuals in that country.
Ezr