One variation is not better than the other, they are different, and should be considered in different situations. Here are 4 situations I consider when deciding which Low Kick variation to use:

DISTANCE – Are you in punch range or outside of it?

POWER – Which variation is more effective for you?

DEFENSE – Is your opponent faster than you? Are they seeing your kick coming and able to defend it?

FOLLOW UP – What are you trying to do after the kick? Do you need to follow with boxing immediately after, or are you looking to kick and exit?