It's inferior in that COMPLETE on Wii has bonus content. But the ports here work fine, and people seem to like the touch controls. $15 for portable, digital Bit.Trip? You can't go wrong, but know that COMPLETE goes for about $23.
If it wasn't there already, QR code functionality is in. Also, the cartridge game and System Settings can't be foldered. And they've changed the thing that happens when it reads your SD card; instead of an empty square, they show a blank slate. Nifty.