One can compare feeding pellet vs mash in terms of weekly wt gain, Total feed required, FCR and livabilty index
When pellet produced, the mix has to have fine grinding may be of 2 mm size as compared to mash feed where mix is coarser
With pellet feed, the gizzard has very little role to play as grinding organ.
More research needs to be conducted about the role of gizzard with pellet feed which still preferred over mash in terms of performance and efficiency.
Regards.