Never tried Katana 3, but have a bit of a warning regarding Hyper 212+: works very well, relatively quiet (don't know if it's better than Katana 3, though), but it's HUGE. Make sure your case can fit it, if you decide to go for it. I had to remove the top case side fan in order to install it. Otherwise, I've seen a lot of people on the forums recommending Hyper 212+ rather than anything else in that price range.