I studied Electrotechnical engineering, Automation and Computer Science. My university program didn't have a major, so I had to study all three.
But my best must have been Computer Science, since I work as a software developer now. I am still working on my graduation thesis, so technically I am still studying. Once I graduate, I will probably take a year or two off from studying, but after that I want to start my studies again to get a Master's degree in Software engineering or Project management.
I liked most of the studies and I like my job. So I am happy I picked them