Its really personal preference they both work fine.
Sword2 gives restrain which is great while soloing and extra time on pain barrier. Getting knocked down while using cyclone or your other skills is really annoying but for endgame content you might have Meltis so pb5 would be fine. Highlander gives you 50% crit attack and Catar Stroke.
I currently have a sword3 hl1 barb1 doppel3