If I were you I'd play it safe and get the Class 6 64G MicroSDXC card. Class 10 should be faster, but if the manual doesn't mention it I'd stick with what is documented.
If you really want a class 10 card you could also call up costomer service and ask them. They might be able to tell you for 100% certain.
You could also just take your chances and try a class 10 card, just keep your receipt to return it if it doesn't work out.
The higher class cards are really intended for devices that need to constantly re write at higher speeds, cameras for example. They are kind of overkill for most tablet uses.