WvW is mainly a place for large-scale wars. Therefore, most members choose equipment/Build to serve the team.
Compared to WvW roaming, equipment/Build is just the opposite. Serve individuals. Roaming players take advantage of WvW.
I often see WvW roaming on YouTube is very ornamental. But the general quality is indeed not high.
The core difference : WvW players and roaming players have different degrees of concentration.