SanDisk Ultra microSDXC Class 10 UHS-I U1 A1 150MB/s 512GB

The choice between the SanDisk Ultra and the SanDisk Extreme primarily comes down to performance requirements, as both models offer a substantial 512GB capacity in the microSDXC format. The key differentiator lies in the speed certifications: the Extreme model boasts a significantly faster maximum read speed of 190MB/s compared to the Ultra's 150MB/s. Furthermore, the Extreme card includes Video Speed Class V30 and a higher Application Performance Class A2 rating, making it better suited for demanding 4K video recording and running applications directly from the card. Conversely, the Ultra is rated A1, making it a solid, reliable choice for general storage and casual use where top-tier sequential speeds are not essential. If you need the fastest transfer times and top performance for demanding mobile tasks, the Extreme is the superior option, though the Ultra provides great capacity at a likely lower price point.