Which is your favorite dancing sim? Dance Dance Revolution, or In the Groove?

As for me, I'd been playing DDR for almost 2 years, and absolutely loved it. Then one day our local Mr. Gatti's got an In the Groove 2 Machine. I saw it and was like "Eew, cheap DDR Rip-off! >_<" But then I started playing it, and found that I actually liked it better than DDR cause it was more of a challenge to me. xD; So my vote goes to In the Groove.

How about you guys?