I myself am studying industrial engineering in the field of mechanical engineering at the RWTH Aachen University and try to give a rough overview of this. Of course, in both courses you usually have the most important business studies, such as accounting, marketing, operations research, etc.Depending on the university/FH, this bWL part may be larger or smaller. The most important difference, then, lies in the technical subjects. Your interests are more likely to be in demand.
In a mechanical engineering degree, you will learn scientific principles (mechanics, thermodynamics, chemistry) in order to apply them to real-life problems.This means, for example, events such as mechanics, thermodynamics, materials science, etc. to visit. This is followed by subjects such as control technology and, above all, machine elements. In the latter case, design rules are taught to you for the construction of machines of all kinds, just as you design them mathematically, so that the said machine element can withstand the loads to be endured in the long run. In my opinion, this is one of the main subjects of engineering in mechanical engineering. Likewise, you usually also have an introductory course in computer science, which, however, only contains a standard programming language and an introduction to object-oriented programming.Depending on the university, you can also choose between different specializations later, which are not always given when studying industrial engineering. Likewise, not every university offers a general in-depth inthesis in the direction of mechanical engineering, but only a fairly general degree in industrial engineering, where you learn different disciplines of engineering such as electrical engineering and mechanical engineering. Depending on your interest, you should pay attention to how broadly your desired university is positioned and whether your degree programme offers different directions in industrial engineering. In industry, and especially in research, however, you will also find many engineers who can also program (although it is usually less the industrial engineers). As networked systems are becoming increasingly important in engineering disciplines, the proportion of knowledge in programming languages is increasing. Unfortunately, I cannot say enough about studying business informatics. I am not at all dissatisfied with my studies, but I would also like to study business informatics, as I also find the course very interesting. As a recommendation for decisions: At your desired universities, check out the course plan and the subjects you need to complete. This should give you a rough overview.
Most importantly, you make a decision so that your interests are sufficiently covered.If you want to study successfully, you must already have an interest in the chosen subject. There is little point in studying just because it offers a good chance of a well-paid job. You’re only successful by having fun by doing what you’re doing.