ata/100 7200 is (should be, if the drive doesn't suck) faster.
ata/100 and ata/133 represent maximum transfer-speed of the controller.
when you're not using a raid 0 confuguration you won't see any speed-differences between equal drives on an ata/100 and on a ata/133 controller.
an 7200 drive has (should have) better seek-times and faster transferspeeds, as the time to read the same amount of data is shorter.
EDIT both drives don't max out the theoretical speed of either ata100 or ata133