The cable drawer used to be simple: USB-A for everything. Then micro-USB arrived. Then Lightning. Then USB-C showed up and promised to unify everything, which it has mostly done — except that “USB-C” describes a physical connector shape, not a capability. Two cables that look identical can have radically different performance characteristics, and buying the wrong one is genuinely annoying.

The spec numbers that actually matter

USB-C cables come in several performance tiers: USB 2.0 (480 Mbps, 60W max), USB 3.2 Gen 1 (5 Gbps, 100W), USB 3.2 Gen 2 (10 Gbps, 100W), USB4 Gen 2×2 (20 Gbps, 240W), and USB4 Gen 3×2 / Thunderbolt 4 (40 Gbps, 100W). The cable included with your iPhone 16 is USB 2.0 — it charges fine but transfers data at 480 Mbps, which means a 60 GB video file takes about 17 minutes instead of 8 seconds via Thunderbolt.

Power delivery follows similar logic. The old 60W standard covers most phones and small laptops. 100W covers 13-inch MacBook Pro. 140W covers 16-inch MacBook Pro. 240W (USB PD 3.1) covers gaming laptops. Higher wattage cables look identical to lower ones — the difference is inside.

The cables we actually use

For daily MacBook charging: Anker 140W USB-C cable (2m). Thick, reliable, carries full power to any USB-C laptop. We’ve used the same one for 18 months without issues.

For iPhone to Mac transfers: Apple’s 1m USB-C cable (came with iPhone 15/16) handles USB 3 speeds from the Pro models. If you have an iPhone 16 standard, upgrade this cable — the stock cable is USB 2.

For desk to monitor: Thunderbolt 4 cable (0.8m). Thunderbolt 4 carries 40 Gbps data, 100W power, and video signal for up to 8K displays in a single cable. The CalDigit 0.8m Thunderbolt 4 cable is our go-to.

For travel: a 1m USB-C to USB-C rated for at least USB 3.2 Gen 2 and 100W charging. Most Anker and Belkin options in this category are reliable.

What to look for on the packaging

Look for the USB logo with the specific generation written underneath. “USB4” or “Thunderbolt 4” on the packaging means the cable supports 40 Gbps. “USB 3.2 Gen 2” means 10 Gbps. “USB 2.0” means the cable is for charging and audio only. A wattage rating (100W, 140W, 240W) tells you what power delivery it handles. A cable with no spec labelling beyond “USB-C” is almost always USB 2.0 quality.