In my opinion any fabric pot is better than a plastic pot. The fabric pots can be buried with the same root pruning qualities they have above ground and will use a lot less water than any pots above ground. Any plastic pots you burry will send roots out of the drainage holes and can make it hard to remove the plants later or damage your root system in the process. Annual vegetables and flowers are not so much a problem as trees, shrubs, and perennials, that can be a real pain once roots penetrate in the neighboring soil.
I'd recommend fabric pots to anyone interested in root pruning plants in ground. Conventional root pruning pots such as Air pots and root makers only work above ground and use a ton of water. Due to their high cost I wouldn't recommend any root pruning pot fabric or plastic for short term crops like potatoes or tomatoes when raised beds work so well.
