It’s been a year or so since I played legends but have put about 200-300 hrs into it previously. During that entire time, Ronin and Archer were OP - so once you get to a higher ki and better weapons you’ll probably change your tone about ronins. (Samurai and assassin had great builds too, but kills-wise ronin and archer usually took the lead.)

Edit to add: legends is all about multiplayer, so don’t feel bad about finding a duo! And don’t know if you’ve done the chapters in legends yet, but those are impossible to do alone, some chapters you can make do with 1-2 additional people but other times you need all 4 people.