If your talking about ones that need a adjustment to execution the most, that would probably be the purple dragon knight.So I'm voting Rune Knight as I love the concept but the current execution just doesn't deliver on it.
Agree. Psi Warrior makes the most conceptual sense.Whelp, we know that whatever it is isn't getting UA attention, so that means it's probable either the enemy Knight or Psi Warrior taken straight from Tasha's without any changes, similar to the other Tasha's subclasses going into the new PHB.
Either would work fine, but I think the Psi Warrior would fit best as a contrast with the other Fighters allowing a Jedi character without juggling the Spell system or Runes.