Nobody else replies, so I will show you why I think that. Out of all my fig trees, three are doing particularly well this year, far as growth. One is Unk Lake Spur, in its second year but this year it has a big raised hump of compost it's been growing in. It was killed to the top of the hump this year when I uncovered it too early but sprang back up many shoots from in the hump.
Then there's Olympian that was set into this 2ft diameter x 1ft tall concrete tree ring, middle of May.
Lastly is the new growth champ so far this year, even if it turns out I can't get any figs from it. This Valley Black in the Fig Doodle. It's a 3ft diameter x 2ft tall mound. She was killed back to the edge of the fig doodle in the spring freeze.
These are all basically big pots in a sense but the roots can go into the ground. Have about 45 others in five gallon buckets, some with the bottoms cut out and set into the ground and others just buckets with drain holes. None come close to these. Whether it's just that the roots have plenty of room or can breath better than those in buckets, the difference in growth is worth noting. This fall I'm digging beside all the buried buckets, cutting up the side and removing them to be replaced by raised mounds, concrete rings, whatever I can do besides plastic buckets.