I do 25 miles a day commuting. Currently use SS roadrat or giant OCR roadbike. Think you’d find roadbike quite a bit quicker – bigger wheels, lighter, no sus forks to squish robbing you of power. I use shorts and a merino or bamboo baselayer most of the time. Shell jacket if cooler, waterproof jkt if wet. Winter boots, winter gloves and tights when it’s cold