As you know, they’re both excellent universities, both strong in engineering, with many similarities. Is the cost a factor for you?
I’m more familiar with Case, as my DS is studying engineering there. I know Northeastern is famous for its co-op program, but Case has strong co-op opportunities for engineers as well.
Here’s an old/closed post that will give you more ideas about the fit/feeling of Case:
Good luck with your choice! You can’t go wrong, of course.