What does a commercial breeder worm tub look like? Can you either describe it or post a photo?Definitely you want more surface area, so your worms will not be on top of each other. It is also a lot easier to harvest the worms out of a container that is more shallow. I have the Costco metal shelf units and each shelf has a large sweater box with worms of various stages. They come with little wheels also, size 41 Qt or 34 3/4" x 16.5" x 6" just as an example.
I once also scored a commercial breeder meal worm tub at work which is my overall favorite.