bzzzt!
K&N are cotton gauze, oiled. TRD and other oiled foam filters, like K&N gauze filters, are racing-oriented, high flow filters that pass more dirt than paper filters...they work very well at what they are designed to do, which is to flow more air than equivalently sized paper filters. Oiled foam is more effective at removing dirt that oiled gauze, in most cases. My opinion is that for protecting an expensive engine, especially in dirty environments, you can't beat quality paper filters, especially when they're as large as the OEM Toyota. The racing filter companies have very effective marketing departments. You won't see oiled gauze or foam filters on heavy duty trucks or off-road equipment, except as cleanable pre-filters.
Feel free to demonstrate otherwise, but that's what my research has shown me...
Steve