Question about sff vs lff chassis

Specifically I was asked about the DL380p Gen8 8-LFF chassis vs. the DL380p Gen8 8-SFF chassis.  I know that the lff = large form factor hard dri ve cage, and sff = small form factor but what are the advanatages/disadvantages of each?

Is it simply that with a sff cage you have room for more drives?  Or is it more complicated than that, as I assum the servers themselves are the same size.  

Thanks