Rossi is not "alot better" than Quag.
He certainly does not score a lot more than Quag, actually their stats are comparable.
If he is better than Quag, it is only marginally.
Rossi has the ability to crack open a game with a brilliant move, scores plenty, assist alot is technically very competent.
quag is an intelligent runner, thats however not a target man, or ballholder, has a long range shot, and scores spectacular goals now and then.
Rossi will win you the big game often, quag wont, unless its with an overheadkick or sth
about the goals :
quag scored 61 goals in 6 seasons serie a, beeing 28(i'm not counting what he did in lower league's)
Rossi, when counting his parma+liga time, has scored 60 goals in 5 seasons, and is 4 years younger. also this season seems to be his real breaktrough with 18 goals in liga alone+ton of assists
he scored more per season, and is FOUR years younger