Hm, most and least:
Well for most I am a bit biased towards Wizard:
Evoker
Enchanter
Necromancer
Illusionist
Then
Conquest Paladin
Gloomstalker Ranger
Fey Wanderer Ranger
Zealot Barbarian
Knowledge Cleric
Battlemaster Fighter
Trickster Rogue
SoulKnife
Least
Way of the Open Hand Monk
Berkerker Barbarian
Beastmaster Ranger
Wild Sorcerer
Arcane Archer Fighter*
*I am on the fence on this one, mostly because it does feel magical just not often enough.
Edit: I realize I am conflicting with some one up top
Soulknife as energy blade fighter I agree doesn't work much
Soulknife as psychic rouge with strange abilities like telekinetic and telepathic weirdness and always seems to have a weapon, works pretty well.
The big problem would be if this was supposed to be the soul knife of 3.5, which would probably been a monk subclass.
Then again Phychic Strike and sneak attack aren't the most disparate abilities.