I bought sandisk16gb ultra memory card. it has reading speed upto 48m/s and writing speed upto 18 m/s.it is the best memory card I ever bought at just 290rs.
It is best for high end cameras and every smartphones. you can even record 2k and 4k videos without any lag. you can transfer your big data within minutes or even in seconds. this memory card is water proof and shock proof. if any one thinking of buying it go for it.