What's the difference between SDHC and SDXC cards?
Storage capacity
SDHC cards: up to 32GB
SDHC (Secure Digital High Capacity) cards are all SD cards with a storage capacity of at most 32GB. You can use them to store vacation photos or videos in Full HD quality. This way, the cards are especially suitable for standard cameras, like compact cameras and camcorders. They're also a good choice when you bought your first camera and want to get started with your hobby.
SDXC cards: more than 32GB
SDXC (Secure Digital Extended Capacity) cards are all SD cards with a capacity of more than 32GB. You can use these cards to store large numbers of files. You can also use these cards for 4K video footage, for example. Thanks to their large storage space, SDXC cards are suitable for professional cameras, like SLR cameras and action cameras. These SDXC cards also a good choice if you're going to make company videos.
Speed
In terms of speed, there's not much difference between SDHC and SDXC cards. Both types of SD cards can reach fast read and write speeds. There are more SDXC cards that fall in the high-end range. Most SDHC cards fall in the basic range or mid-range. If you're looking for a memory card with fast maximum speeds, you'll have more choice with SDXC cards.
Comparison SDHC card and SDXC card
Conclusion
The most important difference between SDHC and SDXC cards is the storage capacity. SDHC cards are microSD cards with at most 32GB, while SDXC card have more than 32GB storage capacity. You can mainly use a SDHC card to store media in Full HD quality and a SDXC card for 4K images or large bulks. There's not much difference in terms of read and write speeds. There are more SDXC cards in the high-end range, but some SDHC cards can also reach high speeds. Before you make your purchase, check the speeds of the memory card and for what use they're recommended.