This tour offers great diversity in means of terrain, steepness and views.

You start walking along the trees, but already ca. after1.5 hours you will have scree under your feets with more steep ascend. Just before Stopselzieher you can have a break at Wiener-Neustädter-Hütte. Stopselzieher itself is a very easy via ferrata, which is almost not exposed. Next time I will do it, I will leave my via ferrata set at home, and everyone who is comfortable on via ferratas graded C/D, can do so. After reaching Zugspitze, the only one technical path remaining is the descend to Zugspitzplatt on the other side, it has ropes on top and some cree on bottom. However, you can leave via ferrata set in your backpack for this descend, at least if you have done Stopselzieher w/o using it, helmet and gloves I would put on. After this short descend you have a long hike infront you which has minor technical difficulty and minor ascends, however you don't want underestimate this second part, since it is very long and you have spend some of your power on the first part.

If I would do this hike again, I will do everything the same way, with only changing the starting position to Ehrwalder Almbahn. This way the way up to the Zugspitze is a bit longer, but the overall hike duration is shorter and you don't need to go through Ehrwald. Also on the plus side your body will have more time to wake up before the real ascend is starting ;)