comparison
I find both videos a good workout. Cathe's seems more of an endurance workout because of the 13 minutes of regular power step aerobics that precedes the interval sections. This, and of course, more choreography (not difficult by Cathe standards) is the main difference between the two videos. Some of Cathe's intervals are great (such as the last one (involving both tuck jumps and flying jacks) and the one that involves jumping with both feet together onto the bench, stepping off and jumping from side to side with both feet together (hard to describe). Others were slightly less intense than expected, such as the ones where you jump from side to side with only one leg at a time. Cathe also has a recovery section after each interval where you just step side to side on the floor. This recovery is less consistent with Gin's tape. Overall, I'd say that Cathe's tape involves more endurance but is not much more difficult than Intense Moves. This of course, assumes that you do Intense Moves at the hardest variation always. Intervalmax does not usually show an easier version.
Irene (interval training nut)