depends on the "work" to be done
Assembly work, carving, sitting on a chair or stool is different than hand planing a surface and handplaning an edge can be different also.
Heavy work that requires downward pressure, will go better at a lower than average height. I'm 5' 11" ...now. :blink:
My work bench with vises is 31"
Table saw and outfeed table is 34"
Router table is 36"
14" Bandsaw is 37"
Radial Arm Saw is 39"
So, it all depends on the type and the scale of the work to be done.
OR you can do this: