What is the difference between branded (packed) and unbranded (loose and sold from gunny bags) nuggets (chunks)?
There is no difference between the two as far as nutritive value is concerned. Hygiene wise speaking yes there may be a difference because the unbranded ones are kept loose in gunny bags and if they are kept in a place where moisture can be absorbed then shelf life may be reduced. And also the chunks from branded source may be of uniform size and the texture after cooking better.