Everything has a different ideal height, so the only perfect height is an adjustable one. Finishing kitchen cabs is not the same as finishing a mantle clock. If you don't want "perfect" for each task, then the best imo is table saw height.
All my bench's are a tad under 37". When I built my main work bench in
1975, I built it the same height as my Table saw for use as an in-feed table. Years later I moved into another house, and it had a "bench" around the walls of half the shop. The height was slightly under 37",perfect for a "wing" extension support on my Tsaw. A few years later my kids bought me a steel 13 drawer mechanics work bench with a maple top. It is just under 37", perfect for my Tsaw out feed table.Other than my original workbench, this height was totally unplanned, but works fine for me.This to me means the people building my steel mechanics bench, and the guy that built the wood "bench" around the walls of my garage, and the guy that built my original tsaw bench were ALL uncannily on the same page.
The correct answer to me then is the same height as her table saw. Also, the standard height of a kitchen counter is 36". That would also be the correct height for a workbench unless the person has special circumstances, as in project specific or other issues like wheel chair, or super short/tall person, or of course owns a tsaw.