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The SanDisk Extreme PRO UHS-I is the current top-rated 1TB microSD card, with 200MB/s read and 140MB/s write.
For the full breakdown, see our best 1 TB Micro SD Card guide.
If you want the fastest 1TB microSD card on paper, the ranking is already decided: SanDisk’s Extreme PRO UHS-I tops the official spec sheets at 200MB/s read and 140MB/s write. Samsung’s PRO Plus sits behind at 180/130, with the standard SanDisk Extreme in between at 190/130. All three are UHS-I microSDXC cards, so they’ll fit any microSDXC-ready device, but the speed you actually get depends on what that device can deliver.
The same trio also shares an A2 rating, which means they’re optimized for running apps directly from the card. If you’re expanding a phone, a camera, or a handheld console, that matters more than a few MB/s of peak read speed.