I usually leave several inches of pot/bag at the top so when I water, with plastic if the water hits the side of the bag it bends n allows the water to spill, maybe I am a dummy and it's my fault but with fabric I dont have that issue, with fabric though sometimes the water will seep through the fabric causing spill.
The primary reason I like fabric is cause it breathes, better for roots.
I have the handles on mine so moving and rotating them is super easy, even with the 20 gallon ones.
Also, if you have high humidity issues plastic bags will collect moisture instead of absorbing it like fabric bags, every little bit helps.