It is hard to separate the "seat" from the "seat position". With some saddles, there is no comfortable postion, and there also is no such thing as "level". Some saddles have a top profile that looks like a banana. Where is level?

After trial and error (and trial and error...) I have found that Specialized Body Geometry saddles work best for me. They make about nine different saddles, in different widths and different degrees of firmness.

For a commuting type of bike, I would use a medium width BG that is firm. Set it so that the rear half of the saddle is dead level to the ground. Set the handlebars so that your hands are as high, or higher than the saddle. (Having your hands lower than the saddle is a recipe for pain, regardless of the brand or style of saddle).

For commuting, you might want to have your saddle a bit lower than a "racing" position. Racers want to get full leg extension, for maximum power. Commuters want maximum comfort, and lowering the saddle half an inch allows you to transfer more weight to the pedals and raise your rear a bit off the saddle on rough pavement.

In sum, for commuting, you need a flat, firm saddle, set level, and a bit low, along with handlebars positioned as high as the saddle. It may take a week or two to get used to a new set-up, but after you have adjusted, you won't be tempted to go back to your prior set-up.