mainly tachyon with unrelenting momentum, as she gets a free attack with every sprint and if she incaps her target, she can get an extra sprint to position. This is opposed to having an extra attack if you had just used the attack action with no target in range. Also, if for some reason you used an overwhelm sprint as prolitariat, sprinting 0 would allow those who are in a good postion to stay there, as unlike scycle formation or brisk effulgence, their is no 'may' on overwhelm's action.