Well, at home or in the arcades, whatever. I've never been to the arcades, which are a lot stricter accuracy-wise, so those scores would probably differ had I tried those songs on one of the machines.

The home versions also take most of the pressure off, like having to pay for three songs, or having to place 20th on the high score list or something. :P

If you get Stepmania, you can play PIU or DDR on your computer, which is also a lot of fun. There aren't a lot of PIU song files available, but Stepmania has a feature that automatically generates PIU steps from DDR steps, so whether you want to play DDR or PIU is up to you.