Depends the layout you want. Some companies make different drawer combos, so SO may have the ultimate bottom box, but you like the machinist's mini drawers on your old Craftsman top boxes. Why not - if it works for you, remember, you're the one who has to work out of the box.
I've also seen cross-sized boxes - a 84" bottom with a 54" top and use the rest for a mini bench. I thought it sounded odd, but the more I looked, the more common it seems that is.