Ignoring power for a moment, which base class has a mechanic package that really helps you "feel" the archetype, incentives you to roleplay as that class?
For me, its likely the barbarian. Its been interesting to watch my players when they play that class. My most timid cautious players suddenly become screaming cannonballs of doom, rushing laughing into danger, ripping apart monsters in melee, its been a real joy to see. That class just incentives that style so well, and players seem to natural gravitate to that immediately when they start playing the class.
For me, its likely the barbarian. Its been interesting to watch my players when they play that class. My most timid cautious players suddenly become screaming cannonballs of doom, rushing laughing into danger, ripping apart monsters in melee, its been a real joy to see. That class just incentives that style so well, and players seem to natural gravitate to that immediately when they start playing the class.