There is no comparison here
Moggi made 10 great transfers and 1 bad one
Marotta made 10 bad transfers and 1 good one
A quick look at this from 2001.
2001-02
Gianluigi Buffon
Lilian Thuram
Pavel Nedved
Cristian Zenoni
Marcelo Salas
2002-03
Salvatore Fresi
Davide Baiocco
Mauro Camoranesi
Marco Di Vaio
Ruben Olivera
Manuele Blasi
2003-04
Fabrizio Miccoli
Stephen Appiah
Nicola Legrottaglie
2004-05
Emerson
Zlatan Ibrahimovic
Fabio Cannavaro
Olivier Kapo
Adrian Mutu
2005-06
Giorgio Chiellini
Patrick Vieira
Robert Kovac
Federico Balzaretti
Domenico Criscito
Giuliano Giannichedda
Gladstone
Christian Abbiati
Those in green you can pretty much say for sure were very good or good, those in red failures, the rest up to opinion.
For Marotta, judging from one torrid season and could change with a good year, but as it stands:
Marco Storari
Marco Motta
Andrea Barzagli
Armand Traore
Leandro Rinaudo
Leonardo Bonucci
Frederik Sorensen
Alberto Aquilani
Simone Pepe
Milos Krasic
Fabio Quagliarella
Luca Toni
Alessandro Matri
Jorge Martinez
Then this season to come.
Very different challenges for both directors, it has to be said. Moggi certainly added less in terms of numbers, whether it was a case that he chose to do that or didn't need to do that. I think the latter. He was in a position over several years where he could buy in a bit more quality each year (or choose not to), and then exchange the peripheral players.