Will the ublox module provide better accuracy or is a matter of the rate at which the APM is sampling and reacting to the GPS?
It looks like the microtek MediaTek gps typically takes 2-3 minutes to get a gps lock, which is about what it takes my garmin (car gps) from a cold boot, so I guess that is normal.
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Well to have 10-15ft hor/6-8ft vert is rather good already due general GPS accuracy is about 15ft. And like Sebastian said too, MTEK is better for Quad use due it's antenna. It is a bit difficult to install uBlox with helix antenna. Helix antennas has rahter small field of view.
Accuracy also highly depends on what software you are using.