CFexpress Type B is the faster, higher-capacity option aimed at heavy video and long raw bursts, while SD UHS-II is the widely available, familiar option that still handles most professional stills work. Your camera’s slots decide what you can use, and many professional bodies take both. Confirm supported cards on the maker’s page.
What each card is built for
CFexpress Type B uses a modern high-speed connection similar to what powers solid state drives in computers. SD UHS-II uses a second row of pins on a standard SD card to run faster than basic SD, but it remains a much older design. The result is that Type B has far more headroom for demanding work.
Side by side
| Trait | CFexpress Type B | SD UHS-II |
|---|---|---|
| Speed headroom | Very high | Moderate |
| Best for | High-bitrate video, long bursts | Stills, general event work |
| Availability | Fewer sellers and brands | Very wide |
| Card reader | Needs a Type B reader | Many computers have a slot |
| Handling | Cards can run warm in long recording | Thin and easy to lose |
Decision criteria
- Do you record video at high bitrates or in raw formats? Choose Type B if your camera supports those modes only with it.
- Do you shoot weddings, events or travel with dual slots? A mixed setup, with one of each, is common.
- Do you hand cards to clients or editors? SD is easier to read on almost any computer.
- Is your frame rate high enough to fill the buffer quickly? Faster cards clear it sooner.
A simple way to decide
- Read your camera’s spec sheet for slot types and the video modes tied to each card.
- Match the card to your longest typical recording or burst.
- Carry spares from the same family so you never have to swap formats mid-job.
- Try the card in your own camera before an important shoot.
Backup habits matter as much as speed. If your camera has two slots, set the second one to record a copy of every frame, so a single card failure never costs you a job. Mixing one fast card for the main file with one SD card for the copy is a common arrangement, and it keeps spending on the faster format to a single slot.
FAQ
Can I mix card types in a dual-slot camera?
Many bodies allow it, using one slot for each format. Which slot handles which task, such as video or backup, depends on the model, so check the manual.
Is SD UHS-II good enough for pro stills?
For many photographers it is. It is the camera’s buffer and the file size that decide whether you need something faster.
The Short Version
Choose Type B when your work involves heavy video or long, fast bursts. Choose SD UHS-II when you want broad availability and easy reading on any computer. If your camera supports both, carrying one of each is a flexible solution.
