WD Black SN770M M.2 2230

If your priority is achieving the best performance for your Steam Deck, the SN770M is the best choice, albeit at a 20% higher cost compared to alternatives. However, considering the platform's modest storage speed requirements, opting for the QLC competitors is a feasible strategy to save some money.

Though a tad pricey, WD’s Black SN770M 2230 M.2 SSD delivers very good performance and is available up to 2TB in capacity. That means twice as many games on your handheld gaming device than with most other 2230 SSDs.

Western Digital's WD Black SN770M is a 2230-sized SSD that can claim to be one of the fastest in its form factor. It's particularly great for higher-end handhelds like the ROG Ally, which can take advantage of its PCIe 4.0 speeds.