I personally fly using mode 2, but I have other quads I fly If you plan to get other things to fly, quads, helis, planes etc I would stick to mode to so everything flys the same way.
I learned to fly my first quad in Mode 3 because it seemed more natural to me at the time, but I've since switched to Mode 2, thinking that it's more "universal".
To make the Mavic go foward and backwards / Right stick Up -- Down ////// RC Plane flight controller /Right stick --- Up = Down elevator / Down = Up elevator