As an ergonomic standpoint its just easier to find stuff at a bit above desk or bar height. I find myself up on my toes looking in my top storage box. Some places at work need the space, vertical holds more, at home where your world is your own would do what floats your boat, personally like bottom box with all the stuff I really use on top, a service cart but since I dont need to lock no top.
I got a bud that is pretty good but 1 change I would make to his shop would be to park the big cab back out of the way and strip a few things he uses 95% and put on a table hi cart with a couple drawers, light. His shop is small enough he could step a few to the big box once a day but its kind of tall. I would cherry pick the couple dozen tools he uses like a mad man and toss on the cart.
I have been working a little in that respect, less is more, keep taking away the stuff we really dont use. Sorting the stuff we do better. I need 3 or 4 more 7/16 wrenches. Maybe I will do a little round up and come up with a couple but when I walked in to the shop for a week it was a shortage I could "feel"
I bought another pair of channeloks in the middle of the season, I got 10 pairs but 4 I like here and there and believe itor not could "feel" it too as well as when I added a couple new razor knives and could feel it tank when I broke a couple tape measures. Its weird but in "fleet" service there is a "volume" for tooling.
As someone said,, a lot of men can work with one tube flare set in a shop provided it wasnt a specialty place but everyone needs some common wrenches, some places not even every one at that. My career, up and down like a yo yo so I got enough stuff to man up without having to make a great effort, we can have men working, next job does not require the stealing of tools from the first etc. They dont got to take wrenches and sockets from each other even in mild manpower spikes.
I amaze myself on occasion,, yesterday there were 5 knives and 10 crecents, now 2 and no 1/2 wrenches or all of a sudden it seems all the 3/4 wrenches are out but it will be a concidence where 2 men each took 2 or a couple got left or set on a job etc. It isnt that we dont have one but it seems the racks havnt been full all summer with the little wrenches.
There is suposed to be a minimum of 6 and the optimum number is 9 and could be 10 to 12 if we wanted to seed a couple extra tool boxes in busy places with them.