Two USB cables can have matching connectors and support different tasks. One may be adequate for charging a device while another is needed for a particular data or display connection. Start with the job, then compare the documented capabilities of the cable and the equipment at both ends.
Write down the devices you want to connect and the result you expect. Charging a phone, copying large files and connecting a laptop to a display are separate requirements. If one cable must do several jobs, list all of them. This prevents a purchase based on a broad label such as “fast” without knowing whether it refers to charging, data or simply the seller's description.
Consult the device documentation for the relevant ports and supported functions. A connector's physical shape does not guarantee every possible feature associated with that connector family. The device, cable and other equipment need to support the intended arrangement. Do not assume that a different cable can add a function the device itself does not provide.
Read the cable's stated power and data capabilities as separate specifications. Look for clear labeling and a model you can identify in the manufacturer's information. USB-IF guidance distinguishes these capabilities; that is a useful reminder not to infer them from color, thickness or an attractive braided covering. If a required capability is absent from the description, treat it as unconfirmed rather than assumed.
Choose a practical length. Measure the route the cable will actually take, allowing for the intended placement without pulling on connectors. A much longer cable can create clutter, while one that only just reaches may constrain the setup. Check both ends: a cable with the right device connector can still have the wrong connector for your existing charger or computer.
Imagine a hypothetical laptop-to-monitor connection. Both devices have USB-C-shaped ports, but you still need to confirm that the particular ports support the desired display arrangement and that the cable is suitable. Paying for a high advertised charging capacity does not, by itself, answer the video question. Resolve the documented requirements before comparing delivered prices.
When the cable arrives, match its identification and markings to the order before using it. Follow the equipment instructions, and do not use an accessory that appears damaged. Keep the specification or packaging information with your device notes. Later, when several similar cables are in a drawer, a simple label tied to the confirmed task is more useful than trying to remember which one looked most expensive.