Two very strong sides indeed and i don't understand what's all the fuzz about the midfield battle. Both formations are used when the teams using them want to control the midfield. Of course Martinez can play the -in front of the CBs- sweeper role effectively and of course Seedorf can defend efficiently, he's the best all around CM of the last 20 years and one of the most clever players i've ever watched.
Both managers have taken similar risks. Annah has chosen to play with Rivaldo on the left wing who isn't good at tracking back, but he can provide cover for them. Even in the extreme occasion where the other team over commits players in the offense (both Ronaldinho and Nedved making runs in the box with both FBs doing overlaps) Annah can afford one free CM (i.e. Viera) to help in any 1v1 situation, i.e. : Lucio on Ruud, Rio on Nedved, Cafu following Ronaldinho, Figo tracking back Carlos, Marcelo on Alves and Seedorf keeping an eye on Scholes. That leaves Viera in a free role to outnumber the opposition in any 1v1 situation.
You see the 4-3-3, played by world class players, can be a very fluid formation, allowing players to move out of position with proper cover and providing the offense with multiple options. What if Zidane moves into wider positions to create numerical advantage on the wings? I don't like the idea of Martinez chasing him around, especially when Ronaldinho doesn't track back and Nedved's work right is overrated on this tread. Both Juventus and Real Madrid took advantage of his ability to do those moves in the attacking third.
Viera is an excellent DM, he never needed Makelele or any other ball winning midfielder at Arsenal. He won titles playing alongside Parlour, Petit, Gilberto, Edu or even Ljundberg at times. The 5 of them combined can't reach Seedorf in his prime. Imo the Zidane-Viera-Seedorf midfield is ridiculously good. And it shouldn't be taken for granted that Annah's team will be caught on the counter too many times just because crappy will let them have possession. If he doesn't commit more players in the offense and he keeps his defensive balance at all times, he won't face such problems. And honestly why should he take such risks? He has players like Zidane, Figo, Ronaldo and Rivaldo who can keep possession high on the pitch and bring their teammates into play. Can you remember Zidane giving away the ball, ever?
Crappy has also done a very good job, i don't have to add anything to what Balu and anton have written above. My only problem with this team is that they'll solely depend on the FBs for providing width in the offense. I would prefer Nedved in his natural position. Even in that goal against Real Madrid (my God what a season that was for him, shame on Meyer for showing him the yellow card that cost him the final when all was over) he made a move from the left wing to a more central position.
If one team has a clear advantage somewhere that would be Annah's team on set pieces. With Scholes, Davids, Alves and Carlos, Nedved, Ronaldinho on the same team and with only the 3 CBs able to win a header in the box (guess Ruud will be on the 1st post) crappy will find it difficult defending set pieces.