I look at it like this: to the best of my knowledge, there are exactly five air filters available for the C14... OE, Hiflo, Bikemaster, BMC, K&N. The first two are disposable paper; the last three are washable/oilable. The last three all say they flow more air AND trap more dirt. IMO, that's not possible. I will stay with the first two.
OTOH there are about 100 oil filters that fit, so if I want to get creative, I can (and have) play with these.
I had another thought. The washable filters are marketed as "race" filters. If you are actually racing and tearing down an engine every race, and have a setup that can benefit from big air, then one of these washable, oiled, hi flow filters might make sense. The more open area and oil should flow and trap more. But it won't last a typical daily rider / commuter maintenance cycle.