Depends how difficult you want cleaning day to be.

With tubs you can dump everything out very easily, with tanks not that much, they are heavy and you take the risk every time to break them during cleaning.

I produce several 1000 of rats each year, not sure how many breeders I currently have but they are in tubs, in racks and while chewing has occurred it has never been to the point of chewing their way out, and chewers are immediately fed off.

If you want them not to chew make sure they have water, food and a block of wood to chew on.