It's time to play "Which card will work in my PS Vita?"! We'll give you a hint: it's the one labeled "Sony PS Vita."
Don't be fooled by the size and shape of the PS Vita's memory card. While it looks similar to the microSD cards surrounding it, there is no cross compatibility. That's right, if you want more memory, you've got to buy Sony's proprietary cards.
The same rule applies to the game cards. They look similar to SD cards, but the pinouts and shape differ in such a way that makes cross-compatibility impossible. Sorry hackers.