Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Audio-Technica - AT2020USB+ | Shure - SM58 |
|---|---|---|
| Max SPL | 144 dB | 150 dB |
| Type | Condenser | Dynamic |
| Connection | USB | XLR |
Between the AT2020USB+ and SM58, the AT2020USB+ comes out ahead in type / connection, while the SM58 wins on max spl. Overall, the AT2020USB+ scores 81.5 and the SM58 scores 67.6 on our Mars Score.
Which should you buy?
The AT2020USB+ is the clear pick on raw spec strength, leading by 13.9 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the AT2020USB+ if you care most about type / connection. The biggest gaps in its favor are type, connection. The single most decisive one: Type: Condenser (vs Dynamic).
Pick the SM58 if you care most about max spl. Its strongest claims are max spl. The single most decisive one: Max SPL — 4.17% more. 150 dB vs 144 dB.
Both ship with comparable polar pattern, so those specs do not separate the two — focus on the differences below.
Bottom line: the AT2020USB+ is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Audio-Technica - AT2020USB+ or Shure - SM58?
Audio-Technica - AT2020USB+ leads the current Mars Score by 13.9 points.The more useful decision is the trade-off behind that result: compare type, connection, max spl against the way you will actually use the product.
Choose Audio-Technica - AT2020USB+ if…
Audio-Technica - AT2020USB+ has the measurable edge on type, connection.
Choose Shure - SM58 if…
Shure - SM58 has the measurable edge on max spl db.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Audio-Technica - AT2020USB+ wins
- ▲Type: Condenser (vs Dynamic).
- ▲Connection: USB (vs XLR).
Why Shure - SM58 wins
- ▲Max SPL — 4.17% more. 150 dB vs 144 dB.
Spec comparison
Spec
| Spec | Audio-Technica - AT2020USB+ | Shure - SM58 |
|---|---|---|
| Type | Condenserlead | Dynamic |
| Polar pattern | Cardioid | Cardioid |
| Frequency response | 20Hz–20kHz | 50Hz–15kHz |
| Max SPL | 144 dB | 150 dBlead |
Connectivity
| Spec | Audio-Technica - AT2020USB+ | Shure - SM58 |
|---|---|---|
| Connection | USBlead | XLR |
| Headphone out | truelead | false |