I suppose one can compare anything on a food discussion board.
I grew up with chicken livers, as well as pâté, pork liver pâté, liverwurst and foie gras.
I don’t mince liverwurst or pâté. I like chopped liver, sometimes… I like that bit of pâté on a banh mi. I enjoyed some foie gras torchons at a favourite restaurant in Montreal (Maison Publique) in November 2019, my last good French meal, then I became sick later the same night, and I suspect the foie had been too rich for my system.
I would never choose to order liver or foie grad, whereas sweetbreads are something I’d choose to order, up there with duck, lobster and crab for me.
I would choose fried chicken liver over kidneys or Andouillette . That’s not saying much. 
