A lot depends on your height and body.
If it's your space, have it designed for you. A six foot tall person with very long legs would have his knees touching his chin in a chair that I'm comfortable on!
I think there are charts and illustrations for ergonomics - how high should YOUR chair be, etc.
I think the heights have to do with where your elbows bend, etc. as far as cutting tables go.
Google: ergonomics - you might find some useful info there.