If I recall correctly, I've read over on mud that the OEM snorkle parts have been added to the U.S. Toyota database order system, so sourcing the parts is no longer a problem, or expensive, if you have the part numbers...which are readily available on mud. I believe I've read that it's actually cheaper than the Safari system.
That said, if/when I do mine, I also prefer the looks of the Safari set up, plus the ease of install. I wouldn't touch the OEM system with a 10 foot pole for those reasons, but in the end, there's probably little functional difference between the two set ups.