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I would prefer the oil screen cap style, but only because it cools the entire flow of oil to the motor down. That said, the valve cover style may only cool the oil going to the head, but that oil is going directly to the head and valves. On an aircooled engine, that's the right place for it to go.
Personally, I think the screen cap system should have a slightly larger heat exchanger given that it is handling the entire system capacity. Wider and taller, and I would mount it horizontally if I could. Since it is horizontal and the front fender may cause airflow issues, the larger cooler could also allow for a small fan and a thermostatic switch, if necessary (hot climate). Have I ever mentioned that I tend to like overkill?
As far as flow direction, i would prefer horizontal. In a vertical application, I would feed top and flow out the bottom.
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