For most commercial open‑plan environments (40–65 dB ambient noise), no—not significantly better. Class A ( ≥ 30 dB) offers additional value for specific use cases such as very quiet offices, regulated industries, and extremely noisy environments. However, for typical open‑plan workspaces, Class B (especially at the upper range, e.g.,  dB) delivers effective ISE attenuation and speech privacy, while retaining advantages in weight, cost, and re‑locatability.