I note that Pixel C does not have GPS. How will it affect DJI Go app without GPS. Is it still good for DJI Go or I should choose Samsung S3 tablet? Pixel C has 500 nits brightest which is best for using it outdoor.

The drone does all the GPS work as far as I know, pixel c should be fine

Tablet without GPS won't effect much during flight, the drone has GPS module built-in, only 'Follow Me' and 'Take the current position as the home point' cannot be used.

it seems to be a perfect tablet with its high 500 nits screen. Regrettably, not for sale anymore in Australia.