SanDisk 512GB Ultra MicroSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUAR-512G-GN6MA Visit the SanDisk Store 4.7 4.7 out of 5 stars 405,408 ratings
The steam deck SD card controller has a max data transfer of around 100-120 MBps. I don't remember the exact figure but a card with faster read/write speeds won't matter if they are higher than the controller will allow.

SanDisk 1TB Ultra microSDXC UHS-I Memory Card with Adapter - Up to 150MB/s, C10, U1, Full HD, A1, MicroSD Card - SDSQUAC-1T00-GN6MA Visit the SanDisk Store 4.7 4.7 out of 5 stars 38,732 ratings

JSAUX 2-Pack Screen Protectors for Steam Deck, Ultra HD Glass Protector 9H Hardness Easy to Install with Guiding Frame Scratch Resistant Tempered Glass for Steam Deck OLED 2023, Come with Toolkits $16.99 $ 16 . 99
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Linus Tech Tips and The Phawx both tested load times on the Steam Deck and found that micro SD load times were almost identical to the SSD in games like Control, Dead Cells, and Street Fighter 5 You may need to turn off DRD in the BIOS. To do this, power off your Steam Deck, then hold Vol + & Power and let go of both buttons when you hear the beep. Go into Setup Utility > Advanced > USB Configuration and turn off DRD as it is not supported. More about this here: Steam Deck lacks USB DRD drivers for Windows.
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sandisk ultra vs extreme steam deck