How high should I make my ceiling in my new shop,,,10 feet or 12 feet

So with 16’ i was able to add a 1000sq mezz added footing for my post. Give it thought before you pour concrete 8’ ceilings on 1st floor second floor is 6’5 or so can’t remember exact height. IMG_2532.jpegIMG_5408.jpegIMG_5406.jpeg