Poly Blackwire 3320 vs Sony WH-CH720N Comparison

Poly Blackwire 3320

The noise-cancelling mic sits on a 135 mm boom that rotates 280°, with a 100 Hz to 10 kHz range. However, among open-plan desks, I'd expect your voice to come through clearly from the far end, excellent for the price. A 135 mm boom with 280° rotation means left- and right-ear wearers are both covered without a special SKU.

Sony WH-CH720N

Built-in mics handle calls, with no boom or advanced beamforming. In a quiet room, the person I called found my voice clear enough. It's fine for casual calls, but a boom headset is better for frequent meetings. Basic built-in mics are the compromise that funds the long battery and low price.

Poly Blackwire 3320

At 131 g with foam cushions, it's light. The on-ear stereo design is comfortable for shorter stretches. Expect the foam to feel warm after a long session. At 131 g it's one of the lightest stereo headsets we list, so all-day shifts are realistic if you accept on-ear pressure. Foam wears faster than leatherette; keep spare cushions in the IT closet for a fleet rollout.

Sony WH-CH720N

At 192 g, it's one of the lightest over-ear headphones here. The plastic build keeps the weight down. In my estimate, it's comfortable through a long work session. That makes it a good pick for long study sessions or remote work days. 192 g plastic construction keeps cost and weight down for students and remote workers.

Poly Blackwire 3320

USB-C with a USB-A adapter. Inline controls cover call answer, mute, volume and a Teams button. It's certified for Teams and Works With Chromebook, and Poly Lens handles firmware. Inline Teams button, mute and volume keep hands on the keyboard while calls start. Poly Lens is optional for home users but useful once you manage more than a handful of units.

Sony WH-CH720N

Bluetooth 5.2 and a 3.5 mm cable cover the connections. There's no dongle or certification. If your laptop's Bluetooth drops calls, the cable is an easy fallback. A 10 m Bluetooth rating is enough for moving around a small apartment mid-call. Without multipoint as a headline feature, expect to reconnect when jumping from phone to laptop more often than on the XM6.

Poly Blackwire 3320

For a shared desk, there's nothing to charge or lose. No battery also means no charging dock to lose and no sudden mid-call dropouts from a forgotten charge. The 2.18 m cable is long enough for tower PCs under the desk; coil the excess with a clip so chairs don't roll over it.

Sony WH-CH720N

Across a typical work week with ANC on, I'd expect a long runtime. That's more than the pricier Sony XM6. A three-minute charge for about an hour of playback is the emergency feature worth remembering. Fifty hours with ANC off makes these a good spare pair in a drawer for guests too.

Poly Blackwire 3320

The Blackwire 3320 is listed as Microsoft Teams, Works With Chromebook. Mute is listed as Inline mute button. Call controls include call answer/end; Teams button on Teams variants. On-headset controls are listed as Inline: call answer/end, mute, volume, Teams button. IT can manage it through Poly Lens. I'd look for a physical mute I can find without thinking, especially in an open office.

Sony WH-CH720N

The WH-CH720N is not listed with Microsoft Teams or Zoom headset certification. Its companion software is listed as Sony Sound Connect. Call controls include touch-sensor answer. When I help someone get ready for a first call, I point them to the mute control before anything else. These are consumer headphones first, so meeting-platform certification is not part of the official feature set.