[Archelaos]

All else being equal, I tend to recommend the C++ job, because it seems you can learn more there. At the beginning of your career it might be better to broaden your knowledge, instead of refining the few things you already know.

I do not think that the decision you make now will necessarily have a decisive impact on your career. You may switch again for your next job, if you feel like it. It is not unlikely that in a few years you will be working in a field that you are not even thinking about today.