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I think it comes down to personal preference and whether or not you want to mess with washing, drying, and oiling a K&N type filter or just cleaning and drying a dry filter. There is also a concern over oil accumulation in the Mass Air, but haven't seen any reported incidences of this on the ZL1. It's also easy to over oil a K&N type filter.
I don't think K&N filters trap as much dirt as they claim vs a dry filter. You may have seen the display where a k&N filter and a dry filter are in a box with a fan a ping pong ball and the ping pong ball is lifted by the fan on the k&N side, while it is stationary on the paper filter side. If you look closely at the cotton gauze in the K&N filter, you'll notice tiny holes in the gauze. K&N claims the oil on the filter traps the contaminants, but I think a lot of them get through and show up a s higher silica content when an oil analysis is performed.
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