I would strongly disagree with that. Juventus have the better centerback pairing, as Chiellini - Bonucci is imo stronger than Kroldrup - Gamberini. Juventus have a better rightback, but of course Pasqual is better than DC
Its harder to compare the midfield, as Fiorentina usually play a 4-2-3-1 while Juve play a straight 4-4-2. I'd say Fiorentina have the better passers in Zanetti, Montolivo and D'Agostino, but Juve have the better tacklers and the harder workers in midfield. As far as wingers go, Vargas is a lot better than whatever Juve have to offer on the left, but i'd say Krasic is comfortable better than Marchionni
In attack Gilardino is probably a better striker than any of Juve's forwards.
All in all other than 2-3 positions, Juve are better in everything else.
Mutu, Jovetic?
I don't rate Bonucci that high nor Motta, and for me both are still question marks. Juventus defence is gonna concede a lot of silly mistakes while they get used to play together. And they could be a huge success or a huge failure.
Fiorentina's defense is average i agree.
You have a point about the hard working players, but Juventus lacks a lot in creativity compared to Fiorentina.
Krasic is better than Marchionni that's for sure, Vargas is a mile aheads of pepe/lanza/martinez/whoever they use on the left, They have two good passers in Marchisio and Aquilani but both won't play together, and we're yet to see what kind of Sissoko and Melo are we gonna see this season.
I don't see much differences between the two sides in terms of who has a better a squad, though i would say that Juventus has more depth than Fiorentina.
But the latter won't play in Europe.