High3 you’ll have various debuffs that would help your party. You have stagger from Cross Guard, Shock from Crown, and Armor Break from Skull Swing. You’ll also deal massive damage to bosses that bleed using your Cross Cut + Skyliner combo. For me the downside is, your damage would really fall bad if the boss cannot be affected by bleed and Skyliner only has 3 overheat.
Barb3 you’ll have great solo buffs that will increase your damage (Warcry + Frenzy), add that with Doppel’s DoV, you’ll gain massive atk boost. Helm Chopper + Cleave will also deal massive damage to mobs that can be stunned, Seism is one of the best aoe skill for a swordsman (has stuns as well), and Pouncing is really one of the most underrated skills of Barb. I can easily do 100k damage with it on a boss that isn’t passable. Barb will only get better with the buffs that we are receiving from KR today. Downside I’d say it falls off late game but you could always level your skill attribute.
To summarize, I’d say Highlander is pretty much more of a team player than a Barb. But I would always pick Barb in terms of dealing more damage than a Highlander. I would take back what I said if Skyliner remained 0 cd, but it didn’t.
Both are great choices and it’s down to what you class you prefer most. You could never go wrong with either build for a 2 hand sword based swordsman. 