I'd say if you're building it for yourself make it a height that's comfortable for you, if you ever sell it it's easy enough for someone to adjust it if required.
I always thought a workbench should be the height of your meat and two veg (specifically the veg) ...has to be the right height for your own height then.
depends how tall you are, and the relationship between your leg length/body length and arm length.
If you make your benches 36" (900mm?), and theyre too high for some jobs, you can always use a step(scaffolding board or two) to bring yourself to the right height
I'm 6ft and I've always found that 'standard' heights are too low for me, my lathe is on raising blocks, I made a new stand for the mill and the bench's in the garage that came with our house drive me mad!
I seem to remember something about a vice should be elbow height?
My main work bench is based on an old hospital bed frame, it has a foot pedal to raise and lower it. I can drop it down to get heavy stuff on and then pump it up to sitting or standing height. Works a treat.