I think you hit the nail on the head early in the post. C++ is what you are most comfortable with. I believe that is the number one reasoning, at first at least

I think you hit the nail on the head early in the post. C++ is what you are most comfortable with. I believe that is the number one reasoning, at first at least (prototype, mvp stage), in deciding that language/stack to use. Use what you know the best as the tech lead, everything else will fall into place.