there is no right or wrong answer here, Everyone's anatomy is diffrent and have different expectations for comfort. so we are justl relating what works for each of us. You will have to figure out for yourself what is best for you.

A brooks 66 saddle works best for me when the bars are at the same or higher than the seat which transfers more of my weight to the saddle. Comparing a brooks B17 to a B66 when sitting on a wider B66 your weight is being supported over a larger area of your butt. Think on a narrow tire versus a wide tire in the sand.

Bab2000 has an excellent explanation of what a brooks does differently from a plastic saddle