What's the best microSD card for SP3

There is no best if you do not specify best. Is it is speed and physical size is not important then have a look at the new USB 3 sticks. The are much faster than a SD card.
I attached a link not because it's the best but to give you an idea of the speed.
 
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I have used both Samsung EVO, Kingston and Sandisk 64gb cards. I've just pre ordered a Samsung EVO 128gb card.

Samsung have some very brave claims about the cards (EVO and Pro models) being able to withstand salt water, dust, etc. I don't know about that, but they are fast.

Someone mentioned using USB 3.0 - as thy are faster. Yes they are, but not very practical to carry around always in, or having to put in/out. For storing videos, music, etc microSD cards are fine - as long as you get a fast one.
 
Hard to say due to unreliable production that seems to plague micro SD. Best bet is to read reviews on newegg, see which one seems to be reliable.