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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want serious, powered over-ear noise cancelling for focused listening at home or on a long flight, choose SOUL by Ludacris SL300MS; if you need a pocketable USB-C wired earphone with a mic and inline volume control for calls and commuting, choose AIAUXAI USB C. They solve completely different problems, so the right answer comes down to how and where you actually listen.
• SOUL by Ludacris SL300MS — biggest strength: full-size over-ear design with active noise cancellation, memory foam ear cushions and full ear cup articulation for a sealed, isolated listen.
• SOUL by Ludacris SL300MS — biggest trade-off: it's wired, bulky, and built around older Apple 30-pin-era device compatibility, so it's a desk/home/travel headphone, not a pocketable one.
• AIAUXAI USB C — biggest strength: a USB-C plug with a built-in high-resolution DAC chip, inline mic and volume remote, plus a storage case — a grab-and-go solution for modern phones.
• AIAUXAI USB C — biggest trade-off: it's an in-ear design, so it won't isolate or envelop you the way over-ear cups do, and it depends entirely on having a USB-C port.
• Who each pick is for: SL300MS → producers, DJs and travelers who want powered noise cancelling and full-size comfort. AIAUXAI USB C → commuters, students and anyone making calls on a USB-C phone, tablet or laptop.
The SL300MS is a full-size, over-ear headphone with active noise cancellation and a wired 3.5 mm connection. What stands out from the specs is how much attention went into the physical design rather than just the driver. It uses a dynamic driver covering a 20Hz–20,000Hz range, which is the standard full-bandwidth span you'd expect from a headphone meant for critical listening. The enclosure mixes plastic, silicone and memory foam, and the ear cups are described as fully articulating with a folding design — a real convenience if you want to pack them down.
The noise cancelling here is "powered," meaning the isolation is active rather than just passive cup sealing. For a producer tracking in a noisy room, a DJ prepping sets on a plane, or a traveler who wants the engine drone pushed down, that's the whole point of buying this model. The memory foam cushions and over-ear fit are what make long sessions bearable. In my opinion, this is the pick for someone who treats listening as a sit-down activity.
Who should skip it? Anyone who lives on a phone with no headphone jack, or who wants earbuds they can stuff in a jeans pocket. The SL300MS is compatible with older iPhone and iPad models via the 3.5 mm jack, so if your gear is USB-C only, you'll need to think about how you'll connect it. It's also a wired headphone — no wireless freedom, no cable-free walking around. If those things matter more to you than isolation and full-size comfort, look elsewhere.
The AIAUXAI USB C is a wired in-ear earphone built around a USB-C jack. The headline feature is the built-in high-resolution DAC chip paired with a dynamic driver, which is the reason a USB-C earphone can sound crisp and balanced at all — the DAC converts the digital signal from your phone rather than relying on an analog jack that many modern phones no longer have. That's the practical appeal: plug straight into an iPhone 17/16/15, an iPad, a Galaxy S-series phone, a Pixel, a tablet or a laptop with a USB-C port and you're listening.
The second thing that stands out is the inline remote. You get a microphone for hands-free calls plus play/pause, skip and volume control right on the cable. For commutes, office meetings, in-car use and calls, that's genuinely useful — you're not digging your phone out every time. It also ships with a PU storage case and a pair of soft anti-slip ear caps, so it's designed to be carried around and used in motion, whether that's running, working out or a flight.
Who should skip it? If you want active noise cancelling or the enveloping feel of over-ear cups, this isn't that — it's an in-ear design, so isolation depends on fit rather than electronics. And if your devices are older Lightning or 3.5 mm only, a USB-C earphone simply won't plug in. It's also wired, so there's a cable to manage. But for anyone whose daily driver is a USB-C phone and who wants calls and controls without fuss, this is the more practical everyday tool.
• Best for active noise cancelling → SOUL by Ludacris SL300MS (powered ANC plus memory foam over-ear sealing).
• Best for calls and hands-free control → AIAUXAI USB C (built-in mic plus inline volume and playback remote).
• Best for long, seated listening sessions → SOUL by Ludacris SL300MS (full-size over-ear cups and articulating fit).
• Best for portability → AIAUXAI USB C (in-ear design with a PU storage case and spare ear caps).
• Best for modern USB-C phones, tablets and laptops → AIAUXAI USB C (native USB-C plug with an onboard DAC).
• Best for DJs, producers and studio-style use → SOUL by Ludacris SL300MS (hi-definition, full-bandwidth 20Hz–20,000Hz dynamic driver).
• Best for travel and commuting light → AIAUXAI USB C (fits in a pocket, comes with a case).
• Best for travelers who want to shut the world out → SOUL by Ludacris SL300MS (active noise cancellation is the deciding factor).
If you'd asked me to pick one, I'd go with the AIAUXAI USB C for most people — because most people listen on a USB-C phone, want a mic for calls, and want something they can carry without a bag. It's the earphone that fits an everyday routine. But that recommendation flips the moment noise cancelling and full-size comfort are your priority: for focused, seated, isolated listening, the SOUL by Ludacris SL300MS is the one I'd choose, and it's the more specialized tool of the two. In my opinion, buy for your actual routine, not for the spec sheet you wish you had. Check the current price on Amazon before deciding, since that's the one number that can tip a close call.
FAQ
It's built for USB-C devices, and the listing names iPhone 17, 16 and 15 along with iPad. If your iPhone still uses Lightning, it won't plug in directly.
The AIAUXAI USB C has a built-in mic plus an inline remote for calls and playback. The SL300MS lists media controls on the ear cups but no microphone.
For blocking engine noise, the SL300MS is the better fit thanks to active noise cancellation and over-ear memory foam cups. The AIAUXAI isolates only as well as its ear caps fit.
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See also: Cyber Acoustics AC-4014 vs AIAUXAI USB Earbuds, SUMWE USB C Headphones vs AIAUXAI USB Earbuds, Bordsek Headphones USB C vs Sundix USB C Headphones