As much as I've come to love Amplitude recently, I have to say that I still like FreQuency more. I just think that Amplitude was a pushover in comparison, with the exception of the Komputer Kontroller and Slipknot songs. Aside from those two songs, the rest of the game was much easier.

The entire last Expert stage in FreQuency still kicks my ass. Once again, thanks to Komputer Kontroller in particular for doing so. Robo-Kid/Intersekt also does a good job of beating me to death.

Also, I like the tunnel from FreQuency better. It didn't move up and down hills, no crazy flashing lights to distract you, and was just a better playing field overall. It was much, much easier to look ahead at other tracks to keep your combo going.

My $.02.