There are different techniques so that you can do things differently. The techniques are supposed to be different. One is using aiki the other is using a foot prop. They both use and develop different skills.
So which is better? Well, if you want to improve your foot skill... that one is better. If you want to improve your aiki, the first one is better. Which is better depends very much on what your viewpoint is and what your goals are.
To often, we focus only on the result in our training. If that gets him down, this will get him down better. Often times in training, we work on things to develop skills.... having more skills gives us more options.
No really, which one is the best, in a pure hand to hand combat situation? The one that got the other guy down.... And that depends on all kinds of things, including how the other guy attacks, defends and responds..... Having more skills, should give us more options in more situations. To that end, I think it is a mistake to muddy up one skill, with another skill, just to show that they "can kind of be the same."