Well, for starters, you’ll get first-class education (German universities are among the highest ranking in the world – right below a few of the American Ivy League and prestigious British universities) and a formal degree to show for it, that is recognized all over the world.
On top of that, the guiding principle of the German higher education being ‘The Unity of Teaching and Research’ (also the cornerstone of what is referred to as the ‘dual education system’), there is a strong emphasis on ‘apprenticeship’ and hands-on involvement on the part of the student, in both the practical application of a large part of what gets learned theoretically and in researching novel ways of problem-solving (at many universities and ‘Fachhochschulen’ access to cutting-edge research facilities is available).
Finally, Germany is an important country and culture, so every international student stands to benefit greatly from familiarity with it (to say nothing of the ton of fun they are certain to have in the process).