A6400 or A6700

I'm debating whether I should purchase an A6400 or A6700.

My main focus is car photography and videography for social media.

Obviously the a6700 better although idk if i justify spending the extra money for it. This would be my first camera although i have been shooting w my iPhone so i have a bit of experience, either or whatever body i will get the lens will be the same

would love to hear your thoughts thanks!