Is it better to run the Ace Unit or a copy of Revolform Tempest in Youthberk rebuild?

Currently struggling to decide between running either the Ace Unit or Tempest in my Youthberk deck since most of the time I won’t have the energy blast needed for the Ace Unit unless I’m going first and more often than not, I’m using Exist over Tempest. Which do you think is better to run?