These are all in US version.
PS2:
DDR Konamix
DDR Max
DDR Max2
DDR Extreme
DDR Extreme 2
DDR Supernova
DDR Supernova 2
DDR X
DDR X2
GCN/Wii:
DDR Mario Mix
DDR Hottest Party
DDR Hottest Party 2 (haven't played though)
DDR Hottest Party 3 (haven't played though)
My Mario Mix pad isn't with me either, so I can only pad the PS2 games. I wouldn't mind a controller challenge, though!
Also on the subject of the DDR X bundled pad, I had some issues with the sensors but didn't notice a size difference. Actually, I returned the pad same-day because the Left and Down arrows were already starting to not respond. I had times when they wouldn't register for 6, 7 arrows in a row and then finally started working again! After getting another one the Down arrow sometimes doesn't register, but it's infrequent enough that I didn't think it justified going all the way back again.
My bundled DDR Supernova pad has a pretty big quirk too - the Down arrow is smaller than the other three (the area that registers is about 2/3 the size) so I have to step back further than normal!
But my Mario Mix pad doesn't have any issues, haha... maybe I should find a way to play my PS2 games with that!
Proud to be serving in the United States Air Force.