They are all viable, if you have a team to support you, you can pick Sword3,Barb1,H1,or Sword2,barb3, or Sw1,H1,Barb3, or Sw1, Pel1, Barb3 they are all pretty good, i could do Solmiki or PvP with all of them no problem. But Sword2 and 3 have the Restrain skill that’s more suitable to CC non-PD classes (Bloodletting) at the cost of loosing some DPS from Highlander and Barb, depending if you choose sw2 or 3.
Pelt1 is great if you’re a PvE lover or even for PvP, to get that HP buff from swash buckling and evasion/def% from Guardian.
They all have their PROS and CONS but the most important part, is to get the team that’s willing to babysit you to the top. Alone, you won’t get far on this game.