Comfort Bike for commuting?
I commute on 28 km/day at 22-25 km/h average. I normally use a city bike, where I am not exactly leaning forward but neither sitting at 90 degrees.


However, I had to use for an entire week a different model, where I was more "seated":



though at the beginning I was feeling more relaxed, on the long run it was not that comfortable: keeping a decent pace was a struggle (drag and head wind, feet slipping on pedals), and also the steering was far less precise than I wanted, resulting in slower rides.

Maybe see if you can borrow such a (or similar) bike and use it for a week or so, before switching to it.