Fighting other Heroes

I am running a game for my friends and most of the characters they’ve made have a more “Suicide Squad”/ “Anti-Hero” vibe about them. So my question is: If they were to get into a fight with say the Freedom Five or Dark Watch, would it be best to make villain sheets for them, hero sheets for them or treat them like high level Lieutinents?

I would recommend stat-ing any enemies that are meant to be fought by your players as “Villains” or Lieutenants, as those are mechanically meant for that purpose, whereas Heroes have a lot more going on and might prove difficult for a single GM to manage.

(I believe there was another thread that asked this same question, but I can’t seem to find it.)