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If you just need extra space for big files, an external hard drive is your best bet—it gives you the most storage for your money. If you want something small and portable for quick file transfers, a USB thumb drive works well, but it’s not great for long-term storage. An SD card is mainly useful for specific devices (like cameras or laptops with SD slots), but it’s not the best choice for general storage expansion.
For the best mix of speed, reliability, and space, go for an external SSD—it’s faster and more durable than a regular hard drive, though a bit pricier.