I commute a similar distance in similar time on a folding bike. As far as comfort goes, it's literallywhatever works for you. That said, sitting more upright is less stressful. No reason you can't raise that handlebar up and maybe lower the saddle a little to make yourself more upright on the road bike. I found that for me, moving the saddle back a little helped with butt main more than anything else. I'm about an inch to inch and half further back that the textbook recommendations. Next you might look at a different saddle.