Trunk growth: colander or field grown

I was wondering if anybody has tested which technique fattens up the trunk faster growing the tree in a colander or in the ground?
I read that colander gives faster results in the first 5 years. After the fifth year trees planted in the ground grow at a higher rate. Just wondering if anybody has had some experience?

Hi @swissbonsai
I would guess ground will be best, as roots air prune in a colendar. You could try planting in a colendar and placing that on the ground to let the root escape for the best of both worlds, then sever under the colendar to repot