It really depends what your condintions over the will be, for example a friend of mine use 40-50 L Pots for outdoor season, he would may be have better harvest when planted in the ground directly, but the biggest Problem is, that the RH goes up really high in Sep/Okt/Nov here & he risks mold on the budds, so in his case it‘s better with the pots cause he can move them around & Take them inside in critical situations…
So it really depends how your Environment will be over the growing period…
But it would be a good idea to dig up a hole & add some organics to Break down prior to start the journey, but I wouldn‘t pay for the amedments, just use kitchen scraps, Take a shit in the hole, use banana peels, potato peels etc. But nothing accidic like lemon or orange peels etc… at least let it compost for a month