too much of this issue depends on one's individual size.
Look for an online link to Architectural "graphic standards." And, here's a tip to get started--for standard kitchen work, a countertop height about 4"-6" below one's elbow (when bent to nominally 90 degrees) is a good place to start. I'm 6'1"--typically proportioned, I think: I have a 32-33" inseam, and a 33" sleeve length. I find counter / bench tops at 38" or so to be a good working height--if the work is on the bench top. When I first started reloading, I preferred standing, and then later sitting on a tall stool.
I suspect that another important variable would also be one's shoulder mobility, and what one can do to optimize that. I have a sore shoulder, and for the last bench I've set up, I now sit (sore back when standing still), and sit on a lower adjustable stool to operate my presses that are mounted on a 42" high bench. This eccentric position affords me the advantages of 1) being able to eyeball my work easier, and 2) the 'upward' motion with my shoulder is less likely to aggravate it.
The point is--study the standards a bit, then modify them for your own needs.
Jim H.