GS vs S/x for pvp
GS is better for mobility and defensive spiky (maul) combat.
Sword is better for kiting around and is usually taken with dagger on LB Zerk builds.
Both have uses but are used for completely different play-styles.
“Observe, learn and counter.”
Equally good, just different. I definitely recommend giving sword a try if you’re not familiar with it.
You can experiment with non-dagger offhands to create entirely new builds as well, although that may limit how effective you are in PvP. You might want to do your experimenting in WvW or a duel server. Things like cele or rabid LB + S/T or complete glass S/A.