Good 'ol Sandisk for me. Faster than my (official) Sony memstick I use in my digital camera and cheaper too.
Though the Datel memory sticks are fine (use one for my cheatsaves from Action Replay), they're slow, transfer wise, and I can only recommend 'em for saved games and some homebrew. ISOs, Movies and PS1 games lag abit on them, from my experiences.
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