Thought I'd update my previous post. I had to pull out those 3 plants for various reasons. However it gave me a chance to inspect roots and make a judgement of fabric pots vs std plastic. The three plants were all the same cuts, veged much the same way for the same period, and were transplanted into final pots 1 week prior to flip. 5 weeks into flower is when I pulled them out. Sifting through the root balls, the two fabric potted plants had a very dense fibrous root system which filled the entire fabric pot, pushing through and growing through the material. Compared with the plastic pot, which showed the roots has found the outer limit of the pot size and had begun to spiral/become bound by it. Having sifted out the roots to reuse the coco, I found that a significant portion of the inner medium in the plastic potted plant to be rather vacant of roots. Nothing like the fibrous mesh I found in the fabric pots.
However the above ground shoots on all 3 plants were much the same (size, development etc). As I couldn't flowered full term, I cannot give a 100% answer on which is better, but can vouch for fabric pots increasing root density for sure. And if the saying of 'more roots = more fruit' is true, then one can draw your own conclusions. With any luck I'll get a better/final result next run.