Using the integrated lower cup you are slightly modifying the head tube angle for which the bike has been originally designed. Perhaps you can get along with a resulting, steeper head tube angle on a road bike. In my case, I didn't see any advantage (rather the opposite) in modifying the relatively slack head tube angle of the Surly Krampus so opted straight away for the EC option. The reductor is relatively cheap and widely available (SJS Cycles for example)
Using the integrated lower cup you are slightly modifying the head tube angle for which the bike has been originally designed. Perhaps you can get along with a resulting, steeper head tube angle on a road bike. In my case, I didn't see any advantage (rather the opposite) in modifying the relatively slack head tube angle of the Surly Krampus so opted straight away for the EC option. The reductor is relatively cheap and widely available (SJS Cycles for example)