I always use genuine mainly because I have had no issues with it and the cost isn't that bad. If I was to use another brand, I would probably go for a Ryco (R2648P). You could get a K&N (PS-7020) if you want as they are a reliable brand, but I personally don't like the look of the filter compared to the genuine one. I know those plastic ends probably don't affect the flow at all, but I'm picky like that. On that note though, if you look at the filter material on the K&N and compare it to the genuine filter, there probably isn't all that much difference.