I don't know if I'd buy a concrete or clay pot of that size. Would be extremely heavy, especially once it's filled with potting mix. I guess if you only had a couple, and you had a hand truck or dolly, maybe you could move it around. But for me, even a fabric or plastic pot with a tree and mix in it is difficult to manuever.
At those prices and sizes you can get very durable root pouches. I think for very large soil volumes root pouches are great. Just have to make sure you get the ones that are very heavy duty. Only problem I had was rodents chewing through it. I think that happens well before the sun does it in. A small hole isn't a problem and the larger ones are easy to patch. I did make the mistake of buying 20 gallon root pouches without handles. The 10 gallon are easy enough to move around, but the 20 gallon get a little hard to grasp without handles. But I got them for cheap at some online site, less than $5/per.